[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] 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
[FIX] Run indico shell inside Flask app context
[FIX] Support URL generation without req context

Uses BaseURL, so if http+https are used the urls will always point to
the http:// version
[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