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Fixes Cygwin compatibility (by Vlad Losev); Improves Python tests (by Vlad Losev); Fixes ambiguous call to implicit_cast; Uses gtest's SkipPrefix() instead gmock's own (by Vlad Losev).

Pulls in gtest r344; improves implicit_cast (by Zhanyong Wan); makes the Python tests work on Windows (by Vlad Losev); adds run_tests.py (by Vlad Losev).