Merge pull request #57 from eugene-matvejev/refactoring_4

RC8 - put back PHP5.5.9 support, following Symfony convetion

Author: Eugene Matvejev

composer.json

@@ -29,7 +29,7 @@
         "bin-dir": "bin/"
     },
     "require": {
-        "php": ">= 5.6.0 || 7.0.0 - 7.0.4 || >= 7.0.6",
+        "php": ">= 5.5.9 || 7.0.0 - 7.0.4 || >= 7.0.6",
         "eugene-matvejev/compass": "^0.1",
         "leafo/lessphp": "^0.5"
     },