Adding PSR-2 code formatting checker

Author: bizmate

composer.json

@@ -21,7 +21,9 @@
 		"psr/log": "1.0.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "3.7.*"
+		"phpunit/phpunit": "3.7.*",
+		"phpro/grumphp": "^0.9.1",
+		"squizlabs/php_codesniffer": "^2.6"
 	},
         "autoload": {
             "psr-4": {

grumphp.yml

@@ -0,0 +1,11 @@
+parameters:
+    git_dir: .
+    bin_dir: vendor/bin
+    tasks:
+      phpcs:
+        standard: 'PSR2'
+        show_warnings: false
+        tab_width: ~
+        ignore_patterns: ['vendor/*']
+        sniffs: []
+        triggered_by: [php]