Django-hashers-passlib

* Support passlib 1.7.
* Add argon2 and scrypt hashers.
* Make hash parameters configurable via the PASSLIB_KEYWORDS setting.
* Add VERSION and get_version() similar to Django.
* Integrate with Travis to run test-suite with Python 2.7, 3.4+ and all
currently supported versions of Django.
* Update python version classifiers in setup.py.
* Also upload wheels.

* Require Python3 >= 3.4.
* Depend on Django >= 1.8.
* Update passlib and bcrypt dependencies.

* Remove distribute_setup.py.
* Implement a generic safe_summary method for all hashers.
* Add bcrypt to requirements.txt.
* Version reported to setup.py is now the same as `git describe` if executed
from a git repository.
* Add a 'version' setup.py command.
* Fix ldap_md5 and ldap_sha1 converters in Python 3.

* Initial release.