Add python mapper/reducer files to create diffs

python/README.md

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+Revision Differ
+
+This script was written to be a streaming mapper for wikihadoop 
+(see https://github.com/whym/wikihadoop).  By default, this script runs under
+pypy (much faster), but it can also be run under CPython 2.7+.
+
+Required to run this script:
+ - revision_differ.py (provided)
+ - diff_match_patch.py (provided)
+ - xml_simulator.py (provided)
+ - wikimedia-utilities (https://bitbucket.org/halfak/wikimedia-utilities)
+
+Author: Aaron Halfaker (aaron.halfaker@gmail.com)
+
+This software licensed as GPLv2(http://www.gnu.org/licenses/gpl-2.0.html) and 
+is provided WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
+implied.