[Bugfix] Admin event states controller
#286
fix #287
[Bugfix] Implements check if mail templates not nil
fix #286
[Bugfix] Added missing namespace for TransitionsException
Send mail attributes are now on default false
Implements "Add template" button for email settings
close #16
Subjects now mandatory if send mail enabled
Merge pull request #360 from ChrisBr/event_states_bf_new

Email Settings refactoring and bug fixes
Refactored proposal. Enabled cancancan