Support multiple slashes in client.push
Fix typo -- config is a dictionary

`self.config` is a dictionary, not an object. References to `self.config.Cmd`
should be `self.config['Cmd']`.
Python 3 compatibility: relative imports

In Python 3, this kind of import doesn't work any more. Relative imports have to
be explicit, as in this commit.
Merge pull request #6 from nickstenning/python3

Python 3 compatibility: relative imports
Merge pull request #5 from nickstenning/config-typo

Fix typo -- config is a dictionary
Fixed quiet option in images()
Merge branch 'master' of https://github.com/dotcloud/docker-py
(WIP) Added unit tests