* add 'docstrings-with-pygments' feature without packages checks and tests
* move syntax_highlight doc filter in compatibility module and define it conditionally
* typo fixed
* add test for optional code highlight ('pygments' and 'markdown' packages must be installed)
* Get rid of runtests.py
* Moved test code from rest_framework/tests and rest_framework/runtests to tests
* Invoke py.test from setup.py
* Invoke py.test from Travis
* Invoke py.test from tox
* Changed setUpClass to be just plain setUp in test_permissions.py
* Updated contribution guideline to show how to invoke py.test