[Rest] + renamed interface 'IFormatter' to 'FormatterInterface'
[Rest] + renamed interface 'IRestController' to 'RestControllerInterface'
[Rest] #86 + added ARestController::createJsonResponse()
[Rest] #86 + updated BundleController actions to use createJsonResponse() instead of createResponse()
[Rest] #86 + updated SecurityController actions to use createJsonResponse() instead of createResponse()
[Rest] #86 + updated PageController actions to use createJsonResponse() instead of createResponse()
[Rest] #86 + updated ClassContentController actions to use createJsonResponse() instead of createResponse()
[Rest] #86 + updated LayoutController actions to use createJsonResponse() instead of createResponse(); - disabled post layout route; + added 'Content-Range' to get collection action
Merge pull request #108 from backbee/86

[Rest] close #86 + use JsonResponse instead of Response (from Symfony component)