Fixed exception raised when changing channel in TS without power to subscribe to channel (fixes #14).

 - Improved also client query response's unescaping to cover more escaped characters.
Initial import of TS plugin which will provide support for positional audio.
Added scenarios for testing if TessuMod TS plugin is installed and  correct version.
Added partial plugin implementation.
Fixed behave tests not reading changed ini-file.
Added python implementation.
Added TS plugin implementation.