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This merges a Google-internal change (117235625).

Original CL description:
This CL was created manually in about an hour with sed, a Python script
to find all the places unqualified 'string' was mentioned, and some help
from Emacs to add the "std::" qualifications, plus a few manual tweaks.

Pull in gtest 696.

method with no default value is invoked (if exceptions are enabled).

Renames internal enums to the kFoo naming style.

Fixes gmock doctor to work with newer versions of Clang.

Reduced template instantiation depth for the AllOf and AnyOf matchers. Also some formatting changes.

Fixes a lock reentrancy when destroying a mock causes destruction of another mock (issue 79) (by Aaron Jacobs).

Expressed the thread-safety annotations in code, replacing the existing comment-based system (by Aaron Jacobs).

Makes Google Mock compile much faster and use much less memory; reviewed by Nico Weber.  This fixes issue 68.

Picks up gtest r536; renames implicit_cast and down_cast to reduce the chance of clash (by Roman Perepelitsa); enables gmock_gen.py to handle storage specifiers (by Steve Fox).

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

Enables more verbose output for expectations (by Sverre Sundsdal); Fixes information loss warning when compiled by VC8.0 with /Wp64; Skips two tests on Windows Mobile that don't work there.

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.

Finishes SafeMatcherCast by catching lossy arithmetic conversions at compile-time; uses ACTION_TEMPLATE to simplify the definition of many actions; makes mock object uncopyable; teaches gmock doctor about wrong MOCK_METHODn.