Mopidy-soundcloud

- Fix Unicode escape sequences in SoundCloud search queries by encoding as
UTF-8. (Fixes 42, PR 55)

- Require Mopidy >= 1.0.

- Update to work with new playback API in Mopidy 1.0.

- Update to work with new backend search API in Mopidy 1.0.

- Add support for new explore API.

- Add support for adding track by URL.
- Fix search parsing.
- Support for adding playlists from "liked" section.
- Fix for track parsing and empty artists field.

- Add support for playing music from groups.

- Update Soundcloud API endpoint.