threadId: Added thread ID handling (via message session) to sink implementation.
threadId: Use threadId on sending
threadId: added line break after command
threadId: parse the thread ID from incoming messages.
threadId: Hand over thread Ids
Merge pull request #9 from penguineer/threadId

Use in-band thread IDs, since the libraries seem not to be reliable.
threadId: Documentation
Merge remote-tracking branch 'tux/threadId'

Added documentation.