Add supported Python versions to classifiers.
Merge branch 'master' into feature/content_upload

* master:
  Add supported Python versions to classifiers.
Fix broken link in AUTHORS.txt
Bump master to 0.9a1
Bump master to 0.9a2dev
Merge remote-tracking branch 'Kotti/master' into feature/content_upload

* Kotti/master:
  Bump master to 0.9a2dev
  Bump master to 0.9a1
  Fix broken link in AUTHORS.txt
Add some tests.