[CLEANUP] Rename Classes/ to src/ (#93)

This will bring the project closer to the default Symfony
project structure.

Author: oliverklee

.github/CONTRIBUTING.md

@@ -116,25 +116,25 @@ We will only merge pull requests that follow the project's coding style.
 Please check your code with the provided PHP_CodeSniffer standard:
 
 ```bash
-vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/
+vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ src/ tests/
 ```
 
 Please also check the code structure using PHPMD:
 
 ```bash
-vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml
+vendor/bin/phpmd src/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml
 ```
 
 And also please run the static code analysis:
 
 ```bash
-vendor/bin/phpstan analyse -l 5 Classes/ tests/
+vendor/bin/phpstan analyse -l 5 src/ tests/
 ```
 
 You can also run all code style checks using one long line from a bash shell:
 
 ```bash
-find Classes/ tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l && vendor/bin/phpstan analyse -l 5 Classes/ tests/ && vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml && vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/
+find src/ tests/ -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l && vendor/bin/phpstan analyse -l 5 src/ tests/ && vendor/bin/phpmd src/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml && vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ src/ tests/
 ```
 
 This will execute all tests except for the unit tests and the integration

.github/PULL_REQUEST_TEMPLATE.md

@@ -22,7 +22,7 @@ style?
 
 You can check for this using this command:
 
-    vendor/bin/phpcs --standard=PSR2 Classes/ tests/
+    vendor/bin/phpcs --standard=PSR2 src/ tests/
 
 
 ### Other Information

.travis.yml

@@ -61,7 +61,7 @@ script:
 - >
   echo;
   echo "Linting all PHP files";
-  find Classes/ tests/ -name ''*.php'' -print0 | xargs -0 -n 1 -P 4 php -l;
+  find src/ tests/ -name ''*.php'' -print0 | xargs -0 -n 1 -P 4 php -l;
 
 - >
   echo;
@@ -76,14 +76,14 @@ script:
 - >
   echo;
   echo "Running the static analysis";
-  vendor/bin/phpstan analyse -l 5 Classes/ tests/;
+  vendor/bin/phpstan analyse -l 5 src/ tests/;
 
 - >
   echo;
   echo "Running PHPMD";
-  vendor/bin/phpmd Classes/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml;
+  vendor/bin/phpmd src/ text vendor/phplist/phplist4-core/Configuration/PHPMD/rules.xml;
 
 - >
   echo;
   echo "Running PHP_CodeSniffer";
-  vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ Classes/ tests/;
+  vendor/bin/phpcs --standard=vendor/phplist/phplist4-core/Configuration/PhpCodeSniffer/ src/ tests/;

Configuration/services.yml

@@ -1,6 +1,6 @@
 services:
     PhpList\RestBundle\Controller\:
-        resource: '../Classes/Controller'
+        resource: '../src/Controller'
         public: true
         autowire: true
         tags: ['controller.service_arguments']

composer.json

@@ -44,7 +44,7 @@
     },
     "autoload": {
         "psr-4": {
-            "PhpList\\RestBundle\\": "Classes/"
+            "PhpList\\RestBundle\\": "src/"
         }
     },
     "autoload-dev": {