This commit introduce a full redesign of all JS views.  We started
basically from scratch.  The goal was to unify all the various views
under a common framework, to make them testable, to make then usable in
different conditions (in studio, or in the frontend), and to make our
lives easier.

Some important points are:
- we introduced new coding guidelines (camelCase, 80 chars width, ...)
- we have a brand new testing framework (still QUnit based)
- kanban view moved to the web addon
- calendar view (formerly web_calender) moved to web as well
- the tree view was removed
- all new code should be documented

We hope that this code is the start of a new era for the Odoo web
client, we want to have a high quality codebase, well documented, well
tested, well designed.

Work done by the framework team: mostly aab, ged, chm, dmo, qsm

The hard coded limit dates back to a time where the browsers would crash
when using FileReader#readAsDataURL() on files of serveral dozens of Mb.
This limit is now obsolete and even IE Edge now supports the FileReader
api.

This commit removes the limit and turns it into an option so it's
possible to limit a particular binary field to a given amount from the
form views, eg:

    <field name="image" widget="image" options='{"max_file_size": "200k"}'/>

Note: this feature only works when the FileReader api is available.
      At time of writing, all major browsers supports this feature:
      http://caniuse.com/#search=FileReader

Avoid duplicating web addon in enterprise by extracting a common basis.
Enterprise features stay in enterprise, but use that common basis.

Mainly:
 - JS refactoring and linting
 - Conversion of .sass into .less split into multiple files
 - Templates cleaning and DOM simplification
 - Re-generation of web.pot, and update of .po files

The copied textarea used in autoresize was a valid target for focus when
using the tab key.  This is a major issue in editable list views,
because when the user leaves a textarea, the list view jumps up, with no
visible focused field.