Add simple unit test
Add unit test for test fixtures
Upgrade to gtest release 1.7.0 + Remove all irrelevant files
Disable check for GLIBCXX version if GTEST_LANG_CXX11 mode is used

We can always expect that std::tuple is available since the C++11 standard includes that.
Merge remote-tracking branch 'remotes/origin/master' into upgrade-to-gtest170

Conflicts:
	wscript
fix warning
Merge branch 'upgrade-to-gtest170' of github.com:steinwurf/gtest into upgrade-to-gtest170
Merge pull request #9 from steinwurf/upgrade-to-gtest170

Upgrade to gtest170