Move findCertainShow() to sickrage module and add tests

sickbeard/__init__.py

sickbeard/dailysearcher.py

sickbeard/helpers.py

sickbeard/postProcessor.py

sickbeard/providers/generic.py

sickbeard/providers/newznab.py

sickbeard/scene_numbering.py

sickbeard/subtitles.py

sickbeard/traktChecker.py

sickbeard/tv.py

sickbeard/tvcache.py

sickbeard/webapi.py

sickbeard/webserve.py

sickrage/media/GenericMedia.py

sickrage/show/Show.py

tests/helpers_tests.py

tests/sickrage_tests/show/show_tests.py