Pep8-naming

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* Separate check for ``__`` in function names to its own code: N807

* Consider all metaclass methods to be class methods

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* Add configurable list of classmethod and staticmethod decorators

* Print the offending name as part of the error message

* Correct N804/N805 for __init_subclass__

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* Note to self: Never do releases before ~0600 or coffee on a Sunday.

* Fix option parsing for Flake8 3.0 (store parsed value on class)

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* Fix integration with Flake8 3.0.0b1

* Start testing against Python 3.5

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* Fix bug where ignored names were not properly split into a list.

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* Fix bug trying to call ``split`` on a list.