NEW FEATURE: Add new events FAILURE for Profile and ChangePassword forms validation

[jjmonagas]

Symfony FOSUserBundle versions: v2.0.1

Describe the feature:
Is it possible to add the same logic for invalid form request like in 'registrationAction()' in 'RegistrationController' but for 'ChangePasswordController' and 'ProfileController'?

Create these new FOSUserEvents and logic:

• FOSUserEvents::PROFILE_EDIT_FAILURE
• FOSUserEvents::CHANGE_PASSWORD_FAILURE