Added redirect to the backend when ?edit query param is present.
View model is now rendered in FrontController.
Refactored front controller to use events to controll dispatch workflow.
Put dispatching document in try catch block.
Added dispatching error document.
Moved code for redirection of document without a slash at end.
Added HTTP status code to response.
Added FetchErrorDocumentListener.
Added config key 'error_documents' to cms config.
Merge branch 'develop' into feature/VP-83
Removed unused method.
Merge branch 'develop' into feature/VP-141
Merge branch 'feature/VP-83' into feature/VP-141

Conflicts:
	src/Vivo/CMS/FrontController.php
Merge pull request #45 from kormik/feature/VP-141

VP-141 Added redirect to the backend when ?edit query param is present.