Revert "Updating version of gmock 1.6.0 --> 1.7.0"

This reverts commit 14391c58c9f871ecfe63a75b462c154b922f9b1b.
refs #7284
Adding gmock 1.7.0. refs #7284
Added check for gmock version.

This also means that I have exported the GCC version and the GMOCK version
to the global namespace.  refs #7284