test_utils: using proper function argument nodes for Py3 in test_compare_ast()
test_utils: Py3 support for test_fn_to_ast()
utils: Py3 support in LocalsVisitor

In Py3 function arguments are arg objects, not Name.
inliner: Py3 support in Inliner

In Py3 the function arguments are arg objects, not Name
Using floordiv for better Py3 compatibility
README: trimmed trailing spaces
test_optimizer: added Py3 support for Falsy
specializer: removing positional defaults corresponding to the positional arguments being specialised

All tests pass now both in Py2 and Py3