* 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
Previously, generation of next/previous links would discard any existing
query parameters. This commit introduces a dependency on URLObject, which
is used to intelligently parse and modify URLs to ensure existing params
are preserved.
Addresses issues #107