[WIP] Add possibility to stopPropagation
Copy/paste error
Add flash for errors
Add ResourceEvent to handle errors instead of stopPropagation
Add Redirects instead of //TODO
Remove redirection on create and update to stay on form when error is detected
Manage error message defined in ResourceEvent
Allow EventListener to set message_type and message
Change Exception type
Add phpSpec for Configuration class
Add possibility to define placeholder value in ResourceEvent
Remove Setters + Add method to stop
Rename property hasError to hasStopped
Add stopPropagation Call when event is stopped
Rename hasStopped to isStopped
Remove getFlashName and use getFlashMessage

This method can be deleted, we can used directly the existing
getFlashMessage
Camelize properties names
Code style corrections
Add DS_Store to gitignore
Remove .DS_Store