Merge branch 'feature/symfony-3.1'

Author: redthor

composer.json

@@ -10,7 +10,7 @@
  ],
  "require": {
  "php": ">=5.3.2",
- "symfony/framework-bundle": "~2.1", 
+ "symfony/framework-bundle": "~2.1|^3.0",
  "antimattr/mongodb-migrations": "~1.0@stable",
  "doctrine/mongodb-odm": "1.*"
  },