White space cleanup according to PEP8
Enable syntax highlighting on README
Added predicate aliases that make more sense in some contexts
Added tox.ini
Prepare v0.3 for release
Bump version to 0.4
Some PEP8 white-space cleanup
Simplified tox.ini
Added invocation tests for each type of callable
Allow partial functions as predicates
Fixed syntax highlighting
Added note to first remove 'rules' from INSTALLED_APPS for autodiscovery to work
Added note for doing absolute imports in Python 2
Apply some formatting to note about absolute imports