Reviewed by Dave Levin.

        WebKit needs a script to interact with bugzilla and automate
        parts of the patch posting and commit processes.
        https://bugs.webkit.org/show_bug.cgi?id=26283

        This is really a first-draft tool.
        It's to the point where it's useful to more people than just me now though.
        Git support works.  SVN support is written, but mostly untested.

        This tool requires BeautifulSoup and mechanize python modules to run:
        sudo easy_install BeautifulSoup
        sudo easy_install mechanize

        More important than the tool itself are the Bugzilla, Git and SVN class abstractions
        which I hope will allow easy writing of future tools.

        The tool currently implements 10 commands, described below.

        Helpers for scripting dealing with the commit queue:
        bugs-to-commit                 Bugs in the commit queue
        patches-to-commit              Patches attached to bugs in the commit queue

        Dealing with bugzilla:
        reviewed-patches BUGID         r+'d patches on a bug
        apply-patches BUGID            Applies all patches on a bug to the local working directory without committing.
        land-and-update BUGID          Lands the current working directory diff and updates the bug.
        land-patches [options] BUGID   Lands all patches on a bug optionally testing them first
        obsolete-attachments BUGID     Marks all attachments on a bug as obsolete.
        commit-message                 Prints a commit message suitable for the uncommitted changes.

        These effectively replace git-send-bugzilla:
        post-diff BUGID                Attaches the current working directory diff to a bug as a patch file.
        post-commits BUGID COMMITISH   Attaches a range of local commits to a bug as patch files.

        post-diff works for SVN and Git, post-commits only works for SCMs with local-commit support (like Git)

        land-* commands in a Git environment only work with simple patches due to svn-apply bugs:
        https://bugs.webkit.org/show_bug.cgi?id=26299
        https://bugs.webkit.org/show_bug.cgi?id=26300

        This script follows python style (similar to how for Obj-C we follow AppKit style)
        http://www.python.org/doc/essays/styleguide.html
        The Python community has a strong style culture and the WebKit style guide is silent re: Python.

        I've filed a bug to update the WebKit style guide to mention python:
        https://bugs.webkit.org/show_bug.cgi?id=26524

        * Scripts/bugzilla-tool: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@44979 268f45cc-cd09-0410-ab3c-d52691b4dbfc