[wysiwyg] Integrated Morrigan

http://morrigan-editor.org/
[morrigan] Internationalised titles
[morrigan] More internationalisation
[morrigan] Default initialisation values
[morrigan] Set size
Merge remote branch 'origin/guimier-wysiwyg' into drogue-design

Conflicts:
	default/languages/en.json
	default/languages/fr.json
[WIP] Morrigan integration in interface
Merge branch 'master' into drogue-design
[entities] Spelling; stop exception propagation
Merge remote-tracking branch 'origin/drogue-design' into guimier

Conflicts:
	index.php
[WIP] [channels] Worked on JavaScript class.
[index.php] Fake channel is no longer needed
[entities] Added “special” entities management
[WIP] List of present users
[entities] Full common management of `last-action`
[js] Fixed some JSHint warnings
[morrigan] Fixed JSHint warnings
[channels] Working updates of the users list.

Documented a bit.
[channels] Small improvements

Testing with `instanceof` is better than only `typeof`.
Close all channels on logout.
Fixed syntax.
[doc] Updated `configuration-values`