When creating a new filter set iterate the filters and apply the parent attribute so the field has a reference to the viewset
Add MethodFilter which will allow for action to be a string and call a class method of the filterset it exists within
* Documentation for the method filter
Tests for the method filter
Use six iteritems to be compatable with python3
Use six to determine the proper text types, unicode no longer exists in python 3
Fixes a bug with python 2.6 deepcoy, see http://bugs.python.org/issue1515
Wrong copy import
Add Python version classifiers

Fixes gh-147.
Improved build matrix.

Added PyPy and PyPy 3.
Allowed failures for the latest django develop version.
Loosened the django version to use the latest minor version.
The matrix should fast finish since it's large.
Used travis_retry in order to avoid build failures due to networking issues.
Fixed the allow failiures section of the build.
Fixed escaping issues and exclusion issues.
Increased test verbosity.
Merge branch 'develop' of github.com:jaredlewis/django-filter into jaredlewis-develop
Merge pull request #165 from carltongibson/feature-MethodFilter

Feature:  Adds `MethodFilter` with tests and docs
Merge branch 'add-classifiers' of github.com:treyhunner/django-filter into treyhunner-add-classifiers
Merge pull request #166 from carltongibson/pypi-add-classifiers

Pypi add classifiers Closes #156
Excluded PyPy from the build matrix for now.
Merge pull request #164 from thedrow/patch-1

Improved build matrix
Added Changes for 0.8 release