Merge ranch 'stable' into release/0.11
Merge branch 'stable' into release/0.11

Conflicts:
	src/Frontend-GNOME/Frontend.cs
Frontend-GNOME: fixed bugged merge
Merge branch 'stable' into release/0.11
Merge tag '0.11' into stable

Tagging 0.11 final
Engine-XMPP: fixed MUC joins with modified/forced nick by the server
Merge branch 'stable'