[REM] l10n_fr_rib module

RIB format is no longer accepted by banks (replaced by SEPA) since 1st of August 2014, in regards of #3331
[FIX] l10n_fr: remove depedency to l10n_fr_rib

Cherry-pick of 4ff1c7c required due to fe1b2c0
[FIX] event_sale: workaround for broken view.

Non-stored fields created with the new API are not converted to old
fields and added in `_columns` (and thus `_all_columns`). This forbid
them to be used in qweb views.
A fix will be commited in 8.0 to address this issue.
[IMP][website_mail] improved template designer, added support for background color, font color and bootstrap buttons(inline css) in mail designer,removed other snippet, changed snippet according to new format,added theme selector in mail_designer, lodeded snippets dynamically based on theme, added font-awesome support in mail snippets, added one controller which convert font-awesome to icon

[IMP] Fixed bug of dropzone,improved behavior of edit mode

[IMP] Improved Behavior for selecting theme while designing a fresh template and some other changes