[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
[classes list] Forgotten update
[fix/rights] All web-accessible files must be readable
[cli] Added user management
Merge remote branch 'origin/teyssier-fichiers' into guimier

Conflicts:
	common/classes.json
[entities] Fixed some errors
[index] Fixed configuration key
[users] Fixed entities management
[cli] Removed .php extensions

As requested.
[config] Switched to static calls
Removed static abstract method

See https://travis-ci.org/Guimier/zzchat/builds/43632052
[cli] Improved documentation (admin & dev)
Merge branch 'guimier'

Conflicts:
	common/classes.json