Reviewed by David Levin.

        Add experimental prototype Rietveld integration to webkit-patch upload
        https://bugs.webkit.org/show_bug.cgi?id=37418

        This patch adds bare-bones integrtion with Rietveld for code reviews.
        The behavior is hidden behind the --fancy-review command line flag.
        Currently, there's no support for uploading more than one patch per
        issue (which is a nice feature of Rietveld).  The plan is to play with
        this for a bit and see if it's useful.

        Modified from Adam's original patch to autoinstall the rietveld upload script.

        * Scripts/webkitpy/common/config/__init__.py:
        * Scripts/webkitpy/common/net/rietveld.py: Added.
        * Scripts/webkitpy/common/net/rietveld_unitttest.py: Added.
        * Scripts/webkitpy/tool/commands/queues_unittest.py:
        * Scripts/webkitpy/tool/commands/upload.py:
        * Scripts/webkitpy/tool/commands/upload_unittest.py:
        * Scripts/webkitpy/tool/main.py:
        * Scripts/webkitpy/tool/mocktool.py:
        * Scripts/webkitpy/tool/steps/__init__.py:
        * Scripts/webkitpy/tool/steps/options.py:
        * Scripts/webkitpy/tool/steps/postcodereview.py: Added.
        * Scripts/webkitpy/tool/steps/postdiff.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@57552 268f45cc-cd09-0410-ab3c-d52691b4dbfc