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allows gtest-config.in to work with an absoulte path for @top_srcdir@. h/t to Jimi Xenidis for reporting the issue and the fix.

Adds threading support (by Miklos Fazekas, Vlad Losev, and Chandler Carruth); adds wide InitGoogleTest to gtest.def (by Vlad Losev); updates the version number (by Zhanyong Wan); updates the release notes for 1.5.0 (by Vlad Losev); removes scons scripts from the distribution (by Zhanyong Wan); adds the cmake build script to the distribution (by Zhanyong Wan); adds fused source files to the distribution (by Vlad Losev and Chandler Carruth).

Necessary changes to gtest-config.in for supporting the up-coming release of Google C++ Mocking Framework.  By Chandler Carruth.