Features
* Client now blocks until a connection to the server is established or a
maximum timeout has been reached, in which case, it raises a
ConnectionFailure exception.
* added ability to delete Docker images on the server to client
(via `DELETE /docker/:image`).
* added to the client the ability to register ephemeral bug descriptions with
the server (via `PUT /bugs/:id`).
* added `containers.patch` to `Client`, allowing patches to be sent from client
and applied to containers running on the server.
* added ability to persist containers as Docker images on the server.