[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] SSO allow public external accounts

- e.g. Google or Facebook
[FIX] Backporting fix from master to v1.1
[FIX] Functional tests
[FIX] Do not send email if no recipients
[MIN] Fix *.egg gitignore
[REM] Display PIN in homepage

- Needed in order to avoid display wrong PIN due to now it is encrypted.
[FIX] Update Vidyo roomPIN and moderatorPIN

- The values are taken from the attached room
[FIX] Collaboration Style.css url
[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