Fix `check_future_import`.

Previously the test never evaluated to True because `node.type` could not
be simultanously equal to `syms.import_from` (297) and `token.NAME` (1).

In addition, avoid printing unnecessary debugging output.
Merge branch 'fix_add_future' of https://github.com/bfroehle/python-modernize
Add fix_raise_six
Merge branch 'master' of https://github.com/untitaker/python-modernize