Clarify the rationale for gmock_all_test.cc, and pull in gtest 669


git-svn-id: http://googlemock.googlecode.com/svn/trunk@461 8415998a-534a-0410-bf83-d39667b30386
Fix warnings encountered with clang -Wall, and pull in gtest 670.


git-svn-id: http://googlemock.googlecode.com/svn/trunk@462 8415998a-534a-0410-bf83-d39667b30386