Fix undefined reference compilation error on Linux and Mac OS X.
According to
http://code.google.com/p/googletest/wiki/FAQ#The_compiler_complains_about_%22undefined_references%22_to
there should be static const member initialization outside of class.
Change file permissions to 644
Merge pull request #803 from winterheart/compilation-fix

Fix undefined reference linker error on Linux and Mac OS X.