[FIX] E-mail user indexing - add to conference

 * If user was registered in a conference before having an account (same e-mail), his/her identity will be automatically tied to the registration in question;
[FIX] Remove awful table width constraint
[FIX] Failure when enabling RB plugin

Fix bug introduced in 39db41f8; dbi is None but the check was missing
[FIX] Explicit db commit calls

Add final dbi.commit() calls when the loop before committed every N
records. This might not be necesasry since chances are good there's a
commit somewhere in the calling code but it's cleaner - otherwise some
of the function's data is committed right inside but the last few
items aren't.
[FIX] Pillow instead of PIL in setup.py

9b544a2 switched from PIL to Pillow but setup.py still referenced PIL.
This causes both to be installed which is a bad idea:
"PIL and Pillow currently cannot co-exist in the same environment"
[MIN] PEP8, obsolete/unused variable
[FIX] Deprecation warning in IPython 1.0+
[FIX] Attach vidyo room PIN fields

- The new booking will take the original booking PIN not taking into account the one set in the form.
- Closes #1455
[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
[FIX] RegForm display rendering process
[FIX] Several fixes

- Backbone views initialization
- New toolbar
[IMP] RegForm: CSS cleanup