Bumped version and updated Changelog 

Merge pull request docker#279 from dotcloud/0.4.0-release Release 0.4.0

Merge pull request docker#245 from dotcloud/0.3.2-release 0.3.2 release

Bumped version to 0.3.1 

Updated changelog, bumped version to 0.3.0 

Updated changelog, bumped version in setup.py 

Bumped version to 0.2.2 

Bumped version to 0.2.1 

Merge pull request docker#42 from dotcloud/0.2.0-dev version 0.2.0

Fixed tests