New upstream release 0.4.0
    
    - http://www.reviewboard.org/docs/releasenotes/dev/rbtools/0.4/
    - Features (post-review):
    -   Defaults for many parameters can now be specified in .reviewboardrc
    -   Added a --disable-proxy option for disabling the HTTP(S) proxy server
    - Bugfixes (post-review):
    -   Fixed authentication problems when accessing the API
    -   Shows a nicer error when trying to update someone else's review request
    -   Fixed crashes when the home directory wasn’t writable
    -   Fixed using --diff-filename=- without a valid cookie
    -   Fixed the link to the Repository Configurations documentation
    - Bugfixes (Git):
    -   Fixed problems when using --repository-url
    - Bugfixes (Mercurial):
    -   Make Mercurial handle the case where there are no outgoing changes
    -   Improve merge support in order to generate better diffs
    - Bugfixes (Perforce):
    -   Using --revision-range on Perforce now provides better errors
    -   Display an informative error if GNU diff isn’t installed
    -   Fix handling of new files in post-commit scenarios