Added config installer, removed unnecessary repositories key

Author: javorszky

composer.json

@@ -5,7 +5,8 @@
     "require": {
         "php-composter/php-composter": "^0.2.0",
         "squizlabs/php_codesniffer": "^2.5",
-        "wp-coding-standards/wpcs": "^0.14.0"
+        "wp-coding-standards/wpcs": "^0.14.0",
+        "dealerdirect/phpcodesniffer-composer-installer": "dev-master"
     },
     "license": "MIT",
     "authors": [
@@ -15,10 +16,6 @@
         }
     ],
     "minimum-stability": "dev",
-    "repositories": {
-        "type": "vcs",
-        "url": "https://github.com/php-composter/php-composter-phpcs-wpcs.git"
-    },
     "autoload": {
         "psr-4": {
             "PHPComposter\\PHPComposter_PHPCS_WPCS\\": "src/"