[IMP] Added timetable menu detailled view option

 - closes #180
[REF] Changed var names and fixed clone menu
[IMP] Choose default Timetable Layout

- Allows to choose the default Timetable layout, between "normal" or "by room"
- closes #1281
[REF] Changed vars names and fixed clone menu
[FIX] Same urls for 2 different actions
[IMP] Search users ignoring accents

- Allows to search for users without taking accents into account
- closes #906
[FIX] Rendering old events with hardcoded urls
[MIN] Improving naming and using index
[FIX] Encoding problems in user browser by letter
[FIX] Access with modification key

- Closes #1416
[MIN] Avoid re-check access
[ADD] backbone, modenizr and polyfill
[FTR] WYSIWYG Registration form

   * WYSIWYG registration form
   * Page rendered on client side
   * HTML5 Validation
   * Position changes can be done with Drag-and-drop
   * Single page for editing of the registration form
   * Radio group buttons can be now ordered by the user
[DEL] previous version of the registration form
[IMP] Better field chooser
[FIX] After flask rebase fixes
[IMP] Update webshim, backbone, jquery-migrate

- Added backbone to ext_modules
- Added webshim to ext_modules
[REF] Move RegForm CSS to SASS folder

- PEP8
[FIX] Several fixes

- Backbone views initialization
- New toolbar
[REF] Moved registration fossils to core