fix auto-invites for rooms with special characters

Currently, auto-invite doesn't work for rooms with special characters such as space.
The problem is, that `Room.Join` is made to simplify work of UI-implementors, who operate with unescpaped room-names.

Event, on the other hand, provides handler with escaped JID
Merge pull request #107 from indeyets/patch-1

fix auto-invites for rooms with special characters