Merge remote-tracking branch 'origin/guimier-connexion' into teyssier-fichiers
addPost and lastPosts functions terminated.

Conflicts:
	common/classes.json
	web/php/WebContext.php
createUser function created
createUser modified
syntax error modified
Error on web fixed
 Veuillez saisir le message de validation pour vos modifications. Les lignes
error web fixed
createUser modified
[channel/create] + Ajax interface
Merge remote-tracking branch 'origin/teyssier-fichiers' into guimier-input

Conflicts:
	common/channels/Channel.php
	common/users/User.php
	web/php/WebContext.php
[tests] Partial fix