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works properly where return type is a reference.

include <functional> when using std::function in gmock.

Distinguish between C++11 language and library support for std::function, std::begin, std::end, and std::move in gtest and gmock.
Bring in gtest 694.

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

Allows mock methods overloaded on argument number or the const-ness of this object to appear on the same source line.