pyflakes
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Global variables must be assigned to be used
Closes #590. This also adds a new NoBindingForNonlocal error
I'm pretty new to pyflakes so just let me know if I messed something up
pyflakes is treating nonlocal the same as globals at the moment, this is starting to fork the two! it doesn't solve https://github.com/PyCQA/pyflakes/issues/249 or https://github.com/PyCQA/pyflakes/issues/461 yet, but at least it opens us up to solving it later?