diff --git a/backend/package-lock.json b/backend/package-lock.json
index 07a6bd9..a76b3a2 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -130,14 +130,6 @@
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-      "integrity": "sha512-fNEiL2+AZt6AlAw/29Cr0UDe4sRAHCpEHh54WMz+Bb7QfNcFw4h3loofyJpLeQs4Yx7yuqu/2dLgM5hKOs6HlQ==",
-      "requires": {
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@@ -822,6 +814,15 @@
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       "dev": true
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+    "bl": {
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+      "resolved": "https://registry.npmjs.org/bl/-/bl-2.2.1.tgz",
+      "integrity": "sha512-6Pesp1w0DEX1N550i/uGV/TqucVL4AM/pgThFSN/Qq9si1/DF9aIHs1BxD8V/QU0HoeHO6cQRTAuYnLPKq1e4g==",
+      "requires": {
+        "readable-stream": "^2.3.5",
+        "safe-buffer": "^5.1.1"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.1.tgz",
@@ -876,9 +877,9 @@
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-      "resolved": "https://registry.npmjs.org/bson/-/bson-1.0.9.tgz",
-      "integrity": "sha512-IQX9/h7WdMBIW/q/++tGd+emQr0XMdeZ6icnT/74Xk9fnabWn+gZgpE+9V+gujL3hhJOoNrnDVY7tWdzc7NUTg=="
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/bson/-/bson-1.1.5.tgz",
+      "integrity": "sha512-kDuEzldR21lHciPQAIulLs1LZlCXdLziXI6Mb/TDkwXhb//UORJNPXgcRs2CuO4H0DcMkpfT3/ySsP3unoZjBg=="
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@@ -1025,8 +1026,7 @@
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-      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
-      "dev": true
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
     },
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@@ -1089,6 +1089,11 @@
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       }
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+      "resolved": "https://registry.npmjs.org/denque/-/denque-1.4.1.tgz",
+      "integrity": "sha512-OfzPuSZKGcgr96rf1oODnfjqBFmr1DVoc/TrItj3Ohe0Ah1C5WX5Baquw/9U9KovnQ88EqmJbD66rKYUQYN1tQ=="
+    },
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       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
@@ -1576,7 +1581,8 @@
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-          "dev": true
+          "dev": true,
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@@ -1597,12 +1603,14 @@
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "1.1.11",
           "bundled": true,
           "dev": true,
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@@ -1617,17 +1625,20 @@
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           "version": "0.0.1",
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-          "dev": true
+          "dev": true,
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-          "dev": true
+          "dev": true,
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@@ -1744,7 +1755,8 @@
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-          "dev": true
+          "dev": true,
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@@ -1756,6 +1768,7 @@
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@@ -1770,6 +1783,7 @@
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+          "optional": true,
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@@ -1777,12 +1791,14 @@
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           "version": "0.0.8",
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-          "dev": true
+          "dev": true,
+          "optional": true
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           "version": "2.2.4",
           "bundled": true,
           "dev": true,
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@@ -1801,6 +1817,7 @@
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           "dev": true,
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@@ -1881,7 +1898,8 @@
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           "version": "1.0.1",
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+          "dev": true,
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@@ -1893,6 +1911,7 @@
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@@ -1978,7 +1997,8 @@
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+          "dev": true,
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@@ -2014,6 +2034,7 @@
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           "dev": true,
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@@ -2033,6 +2054,7 @@
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           "bundled": true,
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+          "optional": true,
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@@ -2076,12 +2098,14 @@
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           "version": "1.0.2",
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-          "dev": true
+          "dev": true,
+          "optional": true
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         "yallist": {
           "version": "3.0.2",
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-          "dev": true
+          "dev": true,
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@@ -2473,8 +2497,7 @@
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-      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
-      "dev": true
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
     },
     "isexe": {
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@@ -2532,9 +2555,9 @@
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-      "resolved": "https://registry.npmjs.org/kareem/-/kareem-2.2.1.tgz",
-      "integrity": "sha512-xpDFy8OxkFM+vK6pXy6JmH92ibeEFUuDWzas5M9L7MzVmHW3jzwAHxodCPV/BYkf4A31bVDLyonrMfp9RXb/oA=="
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/kareem/-/kareem-2.3.1.tgz",
+      "integrity": "sha512-l3hLhffs9zqoDe8zjmb/mAN4B8VT3L56EUvKNqLFVs9YlFA+zx7ke1DO8STAdDyYNkeSo1nKmjuvQeI12So8Xw=="
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@@ -2558,12 +2581,8 @@
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-      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
-      "integrity": "sha1-LRd/ZS+jHpObRDjVNBSZ36OCXpk="
+      "integrity": "sha512-UejweD1pDoXu+AD825lWwp4ZGtSwgnpZxb3JDViD7StjQz+Nb/6l093lx4OQ0foGWNRoc19mWy7BzL+UAK2iVg==",
+      "dev": true
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@@ -2585,6 +2604,12 @@
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       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
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+    "memory-pager": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/memory-pager/-/memory-pager-1.5.0.tgz",
+      "integrity": "sha512-ZS4Bp4r/Zoeq6+NLJpP+0Zzm0pR8whtGPf1XExKLJBAczGMnSi3It14OiNCStjQjM6NU1okjQGSxgEZN8eBYKg==",
+      "optional": true
+    },
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@@ -2665,40 +2690,46 @@
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+      "version": "3.6.1",
+      "resolved": "https://registry.npmjs.org/mongodb/-/mongodb-3.6.1.tgz",
+      "integrity": "sha512-uH76Zzr5wPptnjEKJRQnwTsomtFOU/kQEU8a9hKHr2M7y9qVk7Q4Pkv0EQVp88742z9+RwvsdTw6dRjDZCNu1g==",
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-      "integrity": "sha512-qRjG62Fu//CZhkgn0jA/k8jh5MhACIq8cOJUryH6sck87pgt+C222MSD02tsCq5zNo/B6ZFHtNodZ2qpf8E86g==",
-      "requires": {
-        "bson": "1.0.9",
-        "require_optional": "1.0.1",
-        "saslprep": "1.0.1"
+        "bl": "^2.2.0",
+        "bson": "^1.1.4",
+        "denque": "^1.4.1",
+        "require_optional": "^1.0.1",
+        "safe-buffer": "^5.1.2",
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-      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-5.2.7.tgz",
-      "integrity": "sha512-LI3V/mYj3SHy29dUQvbmS8tKeDS5Ljm1LIfiyCIPNX10KxzDfMQYgh92Umzb6lV6Z/MayKy2HtpNTYHzDU+6xw==",
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-        "bson": "1.0.9",
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-        "lodash.get": "4.4.2",
-        "mongodb": "3.1.1",
-        "mongodb-core": "3.1.0",
+      "version": "5.10.3",
+      "resolved": "https://registry.npmjs.org/mongoose/-/mongoose-5.10.3.tgz",
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+        "kareem": "2.3.1",
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-        "mquery": "3.1.2",
-        "ms": "2.0.0",
-        "regexp-clone": "0.0.1",
+        "mpath": "0.7.0",
+        "mquery": "3.2.2",
+        "ms": "2.1.2",
+        "regexp-clone": "1.0.0",
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+        "sift": "7.0.1",
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+        }
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-      "resolved": "https://registry.npmjs.org/mpath/-/mpath-0.4.1.tgz",
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+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/mpath/-/mpath-0.7.0.tgz",
+      "integrity": "sha512-Aiq04hILxhz1L+f7sjGyn7IxYzWm1zLNNXcfhDtx04kZ2Gk7uvFdgZ8ts1cWa/6d0TQmag2yR8zSGZUmp0tFNg=="
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-      "resolved": "https://registry.npmjs.org/mquery/-/mquery-3.1.2.tgz",
-      "integrity": "sha512-rBo2+eShI/Ko/GFzXMvJvYjzeLRW3P7E4NllAGRyNO90Xw5awo5RI3zCqzuJWe1NSvdL7cGu3RPLuGjZ1TmnmA==",
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/mquery/-/mquery-3.2.2.tgz",
+      "integrity": "sha512-XB52992COp0KP230I3qloVUbkLUxJIu328HBP2t2EsxSFtf4W1HPSOBWOXf1bqxK4Xbb66lfMJ+Bpfd9/yZE1Q==",
       "requires": {
         "bluebird": "3.5.1",
         "debug": "3.1.0",
-        "regexp-clone": "0.0.1",
+        "regexp-clone": "^1.0.0",
+        "safe-buffer": "5.1.2",
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@@ -2954,8 +2986,7 @@
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-      "dev": true
+      "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw=="
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-      "dev": true,
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@@ -3107,9 +3137,9 @@
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-      "integrity": "sha1-p8LgmJH9vzj7sQ03b7cwA+aKxYk="
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/regexp-clone/-/regexp-clone-1.0.0.tgz",
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@@ -3210,8 +3240,8 @@
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       "requires": {
-        "resolve-from": "2.0.0",
-        "semver": "5.5.0"
+        "resolve-from": "^2.0.0",
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@@ -3259,14 +3289,16 @@
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-      "dev": true
+      "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
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-      "resolved": "https://registry.npmjs.org/saslprep/-/saslprep-1.0.1.tgz",
-      "integrity": "sha512-ntN6SbE3hRqd45PKKadRPgA+xHPWg5lPSj2JWJdJvjTwXDDfkPVtXWvP8jJojvnm+rAsZ2b299C5NwZqq818EA==",
-      "optional": true
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/saslprep/-/saslprep-1.0.3.tgz",
+      "integrity": "sha512-/MY/PEMbk2SuY5sScONwhUDsV2p77Znkb/q3nSVstq/yQzYJOH/Azh29p9oJLsl3LnQwSvZDKagDGBsBwSooag==",
+      "optional": true,
+      "requires": {
+        "sparse-bitfield": "^3.0.3"
+      }
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@@ -3330,6 +3362,11 @@
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       "dev": true
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+    "sift": {
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+      "resolved": "https://registry.npmjs.org/sift/-/sift-7.0.1.tgz",
+      "integrity": "sha512-oqD7PMJ+uO6jV9EQCl0LrRw1OwsiPsiFQR5AR30heR+4Dl7jBBbDLnNvWiak20tzZlSE1H7RB30SX/1j/YYT7g=="
+    },
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@@ -3371,6 +3408,15 @@
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+    "sparse-bitfield": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz",
+      "integrity": "sha1-/0rm5oZWBWuks+eSqzM004JzyhE=",
+      "optional": true,
+      "requires": {
+        "memory-pager": "^1.0.2"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -3426,7 +3472,6 @@
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       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
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-      "dev": true,
       "requires": {
         "safe-buffer": "5.1.2"
       }
@@ -3577,8 +3622,7 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
     "utils-merge": {
       "version": "1.0.1",