[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
[IMP] Updated license headers

- Updated to 2014
[MIN] Do not minify angular.js with grunt

* This avoids installing Java
[MIN] fix typo
[FIX] Proper sanitization of abstract fields

 * Without rejecting HTML
 * Added error report capability to LaTeX generator
 * Included bleach module for HTML sanitization
[FIX] Merged several tasks into one (conf loop)
[FIX] SASS: inconsistent font-family for textarea

- Also, style tweaks in RegForm dialog textarea
[FIX] RegForm: Size doesn't apply to number fields
[FIX] RegForm: Resize of textarea fields disabled
[FIX] RegForm: Number fields can't be negative
[IMP] RegForm: Initialization of new field dialogs

- number-based options appear filled with default
- Also, some code cleanup
[IMP] RegForm: Documentation updated
[FIX] RegForm: SASS files loading after rebase
[FIX] font-url issue with fonts and icons
[FIX] RegForm: functional tests
[FIX] RegForm: Currency not selected alerts

- No currency selected alert displayed inconsistently
- Also, improved style of not selected currency in edit view
[MIN] PEP8
[FIX] RegForm: Missing icons in SASS module