Fix #474: jitted functions when return Python ints rather than longs whenever possible (under py 2)
Merge pull request #574 from pitrou/pyint_pylong

Fix #474: jitted functions when return Python ints rather than long
Merge pull request #572 from pitrou/iternext

Iteration refactor
Merge branch 'master' of github.com:numba/numba into heterogenous_unpack