Be able to throw exceptions through the C API

in both directions, from Pyston->CAPI and CAPI->Pyston
Basic support for issubclass() on old style classes
vars(obj).items()
file.flush
Support __getattr__ overloading for old style classes
Old style .__dict__ and .__class__
Some sys-module variables
str.partition
sys.copyright, better old-style __nonzero__
Merge branch 'merge'