Working on constant folding for SCCP
Merge branch 'sccp' into master

Conflicts:
	numba2/__init__.py
	numba2/compiler/optimizations/constfolding.py
	numba2/entrypoints.py
	numba2/functionwrapper.py
	numba2/passes.py
	numba2/runtime/__init__.py
	numba2/runtime/interfaces/numbers.py
	numba2/runtime/obj/__init__.py