New upstream release 0.5.1
    
    - http://www.reviewboard.org/docs/releasenotes/rbtools/0.5.1/
    - Drop upstreamed ez_setup patch
    - New Features:
        * Improved the readability of rbt status output
        * Added a --repository-type option to most commands
        * Added a --list-repository-types option to post-review
        * Added a new rbt list-repo-types command
        * Third-parties can now write new SCM support by creating Python packages
          leveraging Python entry points
    - API Client Changes:
        * Added an API Client method for retrieving resources from a path
        * Add a get_or_create_draft method to the API
        * Restructured the API Client internally
    - Bug Fixes:
        * Fixed crash when copying old post-review cookies for use with rbt
        * rbt commands will now properly generate diffs with moved files
        * Fixed references to non-existent variables in rbt patch
        * Fixed rbt post for Perforce repositories
        * Fixed rbt post and rbt diff for Subversion and Bazaar
        * Fixed post-review and rbt when used for Perforce paths
        * Fixed error handling when posting a review request
    - Packaging Changes:
        * Conditionalize ez_setup