Django-migration-linter

Minor bug fix when no errors detected

* Use logger correctly
* Drop django 1.10 support

* Only consider added migrations during linting
* Change readme to rst format (for PyPi)
* Added examples folder
* Add django (at least 1.10) as requirement for the linter

Assure compatibility for multiple python and django versions.

Try to improve PyPi readme
Better error messages

* Python 3 compatibility
* Faster migration gathering

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* Code base refactoring
* Test base refactoring