Added Rehearsal Validation

Rehearsal Start cannot be during the Company Class break
The break duration is a setting in the AGMA Profile
Updated Account & Company Class/rehearsal bugs

Updated Account bug - job_title to role & refactored labels
Updated Company Class/Rehearsal bug - added invitee count back to
events#index
Add AGMA Dancer as an Employee Role
Removed Roles
Add Scenes (model, controller & views)

Drag & Drop ability for positioning
Remove pagination from scenes
Add Characters (model, controller & views)

Drag & Drop ability for position
Add Appearances to link scenes & characters

Can add characters to scenes on new/edit