Update Service.php

Fixed typo in comments
Provider Cleanup
- Removed the MyOpera provider. Myopera closed March 3, 2014.
- Fixed problems with the Sketchfab provider. The resource Url changed.
Removed 404 urls from Tests
Merged pull request #9 by Robby Taylor
- Typo fixed. Thanks!
Added support for Audiosnaps.com
- Added Tests for the new provider.
- Version bumped to 1.6