Added is_final type trait. Added BOOST_IS_FINAL intrinsic.
Merge branch 'is_final' of https://github.com/K-ballo/type_traits into develop
Oops, move gcc config to correct section.
Fix test case:
* Don't test incomplete types.
* Use new BOOST_NO_CXX11_FINAL macro for checks.
* Use soft checks when no compiler support is present.