Added Administration menu and Edition management
Added Instruments Management pane to Administration
Added list of registrations in adminstration panel
Added room model, admin panel to manage them and some styling in admin panel
Added Juge panel in administration panel.
Added some styling and two migrations
Minor styling for Administration panel
PROJ-122: Added Juge form in Administration panel'
PROJ-122: Added juge role association to new entries
PROJ-123: Added devise_invitable gem
PROJ-123: Added missing files in previous commit.
PROJ-123: Added accompanyist views, controller and model.
PROJ-59: Completed the grid with composer and piece
PROJ-126: Added views, controller and models for teacher.
PROJ-124: Added a User field to registration form, only if admin.
PROJ-120: Added role selection when account created by admin.
PROJ-121: Datatables.net intergration
 - Added a separate script to habdle datatables
 - French traduction
 - Added buttons
  - Add: Clear form
  - Delete: Send ajax request
  - Update: Send ajax request
 - Changed sorting arrows
 - Conventions over configurations datatables intergration
Merge branch 'administration' of github.com:Inovitex/fcms into administration

Conflicts:
	app/assets/stylesheets/bootstrap_and_overrides.css
PROJ-121: Moved format date to application.js
PROJ-121: Fixed bug on multiple pages selectable row