add versioning

Author: Jovel Crisostomo

buildspec.yml

@@ -3,7 +3,6 @@ version: 0.1
 phases:
   install: 
     commands:
-      #- go get -u github.com/gorilla/mux
       - go get -u github.com/golang/lint/golint
       - go get -u github.com/tools/godep
 
@@ -15,13 +14,12 @@ phases:
 
   build:
     commands:
-      - echo $PWD
-      - go build -v -o rt_api_prototype
+      - go build -v -o build/rt_api_prototype-$CODEBUILD_SOURCE_VERSION
 
   post_build:
     commands:
       - echo Build completed on `date`
 
 artifacts:
   files:
-    - rt_api_prototype
+    - build/*