Add GoogleTestRunner to GTM.
This allows you to easily mix and match SenTest with GoogleTest
https://code.google.com/p/googletest/
which is nice when working with C++ code.

Also adds GTMCodeCoverage which allows you to do code coverage with Xcode 5 and iOS7.

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git-svn-id: http://google-toolbox-for-mac.googlecode.com/svn/trunk@645 7dc7ac4e-7543-0410-b95c-c1676fc8e2a3