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

test/tests/class_noctor.py

-# skip-if: sys.version_info.micro >= 4
+# skip-if: sys.version_info.micro < 4
 # - Error message changed in 2.7.4
 
 # Regression test:

test/tests/object_new_arguments.py

-# skip-if: sys.version_info.micro >= 4
+# skip-if: sys.version_info.micro < 4
 # - Error message changed in 2.7.4
 
 # object.__new__ doesn't complain if __init__ is overridden: