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).

scons/SConscript.common

@@ -119,6 +119,7 @@ class EnvCreator:
       # selecting on a platform.
       env.Append(CCFLAGS=['-pthread'])
       env.Append(LINKFLAGS=['-pthread'])
+      env.Append(CPPDEFINES='GTEST_HAS_PTHREAD=1')
   WithThreads = classmethod(WithThreads)
 
   def NoRtti(cls, env):