Cleans up the unit tests that are meant to be run with nosetests
* Renames all test modules to start with test_ so that nosetests does
not need to be run with the --all-modules flag in order to pick them up
* Renames test_helper to fakes and removes imports in unit tests that
did not reference the fakes
* Adds nose to pip-requires so that run_tests.sh -V will install nose
into the virtualenv instead of having to manually install it after running
into import errors :)
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