Fixed bug in ChannelUID.getThingUID

Signed-off-by: Alex Tugarev <telekom@tugarev.de>
Added listener notification on add/remove of ThingProvider

Signed-off-by: Alex Tugarev <telekom@tugarev.de>
Merge pull request #48 from qivicon/thing-bugfixes-final

Bugfixes in ChannelUID and ThingRegistryImpl