New upstream release 0.4.2
    
    - http://www.reviewboard.org/docs/releasenotes/dev/rbtools/0.4.2/
    - New Features:
    -  * The .post-review-cookies.txt file is now made readable only by the calling
         user, improving security
    -  * Improved debug output
    -  * Updated our Plastic support for Plastic 4.0. This is no longer
         compatible with previous versions
    -  * A revision to diff against can now be specified when using hgsubversion
    - Bug Fixes:
    -  * General:
    -    * Using UTF-8 in the summary or description no longer breaks
    -    * The GNU diff error no longer mentions Subversion specifically
    -    * Posting a diff to a submitted review request now displays an error
           instead of reopening the review request
    -  * Clearcase:
    -    * Fixed base path generation for Clear Case
    -  * Git:
    -    * Fix issues when running post-review within a git submodule with recent
           Git revisions
    -    * Git diffs no longer include diffs from submodules, preventing useless
           diffs from being created
    -    * post-review no longer breaks when run from a detached Git HEAD
    -  * Mercurial:
    -    * Fixed bailing on harmless warnings when running hg commands
    -    * Fixed path calculation for hgsubversion when the path contains a
           username
    -  * Subversion:
    -    * Scanning for the right repository is much faster now when there are lots
           of Subversion repositories on the server
    -    * Fix handling of revisions with deleted files for Subversion
    -    * Handle modifications inside moved/copied directories for Subversion