Noissue - Add a script for converting Rietveld patches to Git format

patchconv/README.md

Index: patchconv/README.md
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+# Convert Rietveld patches to apply them locally
+
+The `patchconv` module and `patchconv` script convert SVN-style patches that
+are downloaded from [Rietveld](https://github.com/rietveld-codereview/rietveld)
+code reviews to Git-style patches that can be used as input for `hg import` or
+`git apply`.
+
+In many cases the patches from the review can be applied directly with
+`patch -p1`. However, if the changes contain copies or renames or include
+binary files, `patch` will not apply them correctly. Git and Mercurial commands
+will also not work because when the changes are uploaded to the review, they
+are converted to SVN-like format that Rietveld normally works with. `patchconv`
+undoes this conversion and returns the patch to the state where it can be
+applied using Git or Mercurial.
+
+## Installation
+
+Install directly from Mercurial repository using pip:
+
+    $ pip install 'hg+https://hg.[Dadblockplus.org/codingtools#egg=patchconv&subdirectory=patchconv'
+
+## Usage
+
+The script in the package will be available immediately after the installation.
+Its interface is simple: it reads from stdin and writes to stdout.
+
+    $ patchconv <patch-from-rietveld.diff >git-patch.diff
+
+## Testing
+
+The tests can be run via [Tox](http://tox.readthedocs.org/)