use existing self.client in view tests.
added a test to ensure '/?page=99999' works.
Run test suite much faster.

Thanks Django docs!

https://docs.djangoproject.com/en/1.4/topics/testing/#speeding-up-the-tests
added tests for /find.json endpoint.
refactorings to directory views test suite.
added more tests.
added a UserEdit view test for invalid form submissions.
added POST tests for /orgs/:slug/edit/ endpoint.
search field placeholder txt for untrusted users doesn't mention people.