0.1.1 release

The 0.1.1 adds convenience imports for the Django management command overrides. It also changes the functionality of the base command's check_program() and check_command() methods, automatically raising a CommandError if a check fails.

For example, instead of importing CollectStaticCommand from commando.django.contrib.staticfiles.management, you can import it a little more easily from commando.django.contrib.staticfiles.