PHP 5.4 support

Author: josegonzalez

composer.json

@@ -13,14 +13,14 @@
     ],
     "require": {
         "cakephp/cakephp": "~3.0",
-        "php": ">=5.4",
+        "php": ">=5.5",
         "league/flysystem": "*"
     },
     "require-dev": {
         "phpunit/phpunit": "4.1.*",
         "league/flysystem-vfs": "*",
         "cakephp/cakephp-codesniffer": "dev-master",
-        "satooshi/php-coveralls": "1.*"
+        "satooshi/php-coveralls": "dev-master"
     },
     "autoload": {
         "psr-4": {