Flake8-import-order

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* Added new Edited style, this is equivalent to the Smarkets style
except that values specified in the ``application-package-names``
option must be imported after third-party import statements
* Added ability to extend a style using an entrypoint.
* Fix ambiguous I100 error, now lists correct packages.

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* Enforce lexicographic ordering for Google, Smarkets and AppNexus
styles. This may introduce warnings not present in previous
releases relating to case sensitivity.
* Fix I100 case sensitivity for ungrouped imports, again enforcing
lexicographic ordering.

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* Added new AppNexus style, this is equivalent to the google style
except that values specified in the `application-package-names`
option must be imported after third-party import statements
* Fixed ungrouped ordering bug whereby I100 wasn't triggered.

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* Fix error when checking from stdin using flake8 3.0.

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* Fix case sensitivity bug for Google and Smarkets style.

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* Drop pep8 requirement and replace with pycodestyle.
* Support Flake8 3.0 (alongside Flake8 2.X).
* Drop Python2.6 compatibility.
* Fixed a bug where intermixed 1st and 3rd party imports cause an
error with the PEP8 style.
* Fixed a bug whereby the I101 recommended ordering wasn't a valid
ordering in the cryptography style.