Refactor iteration support, enable nopython iteration over tuples and tuple unpacking
Remove print() statements
Add checking of resulting tuple length when unpacking an iterator
Use force_pyobject when we want to stress the object mode
Merge branch 'master' of github.com:numba/numba into iter_refactor
Merge branch 'master' of github.com:numba/numba into iter_refactor
Merge pull request #567 from pitrou/iter_refactor

Refactor iteration support, enable nopython iteration over tuples and tu...