Django 1.4 compatibility. related #228
Include tests Django 1.4.10 (LTS version) rel #228
Fix travis-ci matrix
Fix travis-ci matrix indentation
Update features summary [skip ci]
Fix for cleanup command doesn't actually clean thumbnails #130
Merge branch 'master' of github.com:mariocesar/sorl-thumbnail

* 'master' of github.com:mariocesar/sorl-thumbnail:
  Update features summary [skip ci]
Handle when you get and empty string from the keystore when serializing. Rel #168
Make sure future upgrade of django will be used. Enable wheels again
Fix using wheel
Duh! If wheel variable is set install wheel package
Wheel package for PyYAML to speed up the tests
Fix bash syntax
Do nothing operator
PyYAML is not a supported wheel on Python3 [skip ci]
Take fix from changeset:26888e1 by @pixelogik related to #144
Remove last stalling test
Vagrant box with tox

To ease local development it's nice to have a VM with all dependencies installed.
Tox is used to create multiple virtualenvs for each tripe of versions/settings:
python-django-settings.

How to use:

* install vagrant (http://www.vagrantup.com/downloads)
* cd in sorl-thumbnail folder
* $ vagrant up
* $ vagrant ssh
* $ runtests

Runtests is an alias to customized tox invocation (some rsync hackery is needed to make it work, but nothing special). More on tox: http://tox.readthedocs.org/en/latest/

E.g. runtests -e py33-1.6-pil works for tests in specific env only.
Skip sdist step to speedup tests
Greatly simplify things