Remove SessionsClient and move some of this functionality to the ServicesClient.
Remove now obsolete views client.
Bump version to v0.2.0.
Update keywords.
Make dependency version requirements less strict.
Update events feed poller.
No need to pass service id to ServicsClient.create and .register method since
the id is user provided.

Also pass HeartBeater object to .register method callback.
Fix register method.
Update example files.
Modify poller to recognize service.remove event.
Merge pull request #11 from racker/remove_sessions_client

Remove sessions client