- Removed dependency on full protobuf library.  Client now builds/runs with only protobuf lite.
- Squelch duplicated registrations.
- Use enum instead of String for Service/Listener intents for faster switching.
- Fix issues in Apache HTTP client usage and refactored AndroidChannel for enhanced testability.
- Change to protobuf-based configuration.


git-svn-id: http://google-cache-invalidation-api.googlecode.com/svn/trunk/src/google@188 1cc9d426-c294-39be-ba72-c0199ca0f247