Twig 2.0 support

Author: sescandell

composer.json

@@ -16,9 +16,9 @@
     ],
     "require": {
         "symfony/symfony": "~2.8|~3.0",
-        "twig/twig": "~1.23",
+        "twig/twig": "~1.26||~2.0",
         "twig/extensions": "~1.0",
-        "symfony2admingenerator/form-bundle": "~1.3"
+        "symfony2admingenerator/form-bundle": "~1.4"
     },
     "suggest": {
         "symfony2admingenerator/generator-bundle": "The missing symfony2 admin generator",