GitLab

Adds threading support (by Vlad Losev); updates the version number (by Zhanyong Wan); adds release notes for 1.5.0 (by Vlad Losev).

Removes duplicated definition of SetArgumentPointee (by Vlad Losev); Makes gmock compilable on platforms that don't have ::abort() (by Acadeli Checa); Fixes compatibility with Symbian's STLport (by Acadeli Checa).

Implements .With() as a synonym of .WithArguments(); implements AllArgs(m) as a synonym of m; relies on gtest-port to #include tuple; fixes a compatibility with Symbian.

Made the universal value printer safer when printing char[];
Removed duplicated code in InvokeWith;
Improved gmock_doctor.py.