Update to API v2

- Replace apps model with host
- Connect to standard Docker instance via SSL
Remove CLI
Move api to top level package
Update docker-py

From https://github.com/dotcloud/docker-py/commit/7a39cda22a47298337595edac67069d13cd4bf4e
Fix client instantation methods
Update README
Update version, user-agent string and default API URL
Merge pull request #2 from orchardup/api-v2

API v2