Fix cannot create database error

See doctrine/DoctrineBundle#351

Author: jmontoyaa

app/config/config.yml

@@ -149,12 +149,8 @@ doctrine:
                 user:     "%database_user%"
                 password: "%database_password%"
                 charset:  UTF8
-                # if using pdo_sqlite as your database driver:
-                #   1. add the path in parameters.yml
-                #     e.g. database_path: "%kernel.root_dir%/data/data.db3"
-                #   2. Uncomment database_path in parameters.yml.dist
-                #   3. Uncomment next line:
-                #     path:     "%database_path%"
+                server_version: 5.5
+
         types:
             json: Sonata\Doctrine\Types\JsonType