Add composer test, phpunit and phpcs scripts

Author: akrabat

composer.json

@@ -35,11 +35,20 @@
         "container-interop/container-interop": "^1.1"
     },
     "require-dev": {
+        "squizlabs/php_codesniffer": "^2.5",
         "phpunit/phpunit": "^4.0"
     },
     "autoload": {
         "psr-4": {
             "Slim\\": "Slim"
         }
+    },
+    "scripts": {
+        "test": [
+            "php vendor/bin/phpcs",
+            "php vendor/bin/phpunit"
+        ],
+        "phpunit": "php vendor/bin/phpunit",
+        "phpcs": "php vendor/bin/phpcs"
     }
 }