Pull in gtest 687.


git-svn-id: http://googlemock.googlecode.com/svn/trunk@478 8415998a-534a-0410-bf83-d39667b30386
Add MockFunction::AsStdFunction(). Also pull in gtest 688.


git-svn-id: http://googlemock.googlecode.com/svn/trunk@479 8415998a-534a-0410-bf83-d39667b30386