Feature/go 1.2

* update godeps with commit hash from https://github.com/docker/docker/tree/v1.2.0
  https://github.com/docker/docker/commit/fa7b24f2c3948d1eb52453c609417a6bc7eba5dd#diff-d41d8cd98f00b204e9800998ecf8427e
* remove nsinit
* fix ParseRepositoryTag