Docker-hub

This release adds two new commands:

* builds - To query auto-builds of a repository
* queue - To query the auto-build repositories with pending builds only

Also includes few small bug fixes

- Adds `users` argument which gets Docker Hub user profile.

- Adds support for querying tags of repository

- Hide user password typed by user when logging in to docker hub
- Use python wheels format for distribution.

First Release!

Supports:
- Querying repos for organization