cmake update check-pyston testing to match make check
cmake properly exclude llvm from the "all" target
-now we only build the parts of llvm that are actually required
fix object_new_arguments.py and class_noctor.py skip-if
-these should now be skipped for python < 2.7.4, not >= 2.7.4
-check-pyston now passes on ubuntu 12.04 (including travis-ci.org) and 14.04