Bump version to v0.7.3
Merge pull request #3439 from dotcloud/bump_v0.7.3

Bump v0.7.3
Change version to 0.7.3-dev
Changelog date typo fix: 2013-01-02 -> 2014-01-02
Merge pull request #3448 from tmahesh/patch-1

Changelog date typo fix: 2013-01-02 -> 2014-01-02
Merge pull request #3445 from dotcloud/merge_release_v0.7.3

Merge release v0.7.3