Added some custom features to admin to help user verify polls data and create more poll choices
Added class PollMethodTests with methods in polls/tests.py to test Poll Model
Added poll factory method "create_poll" in polls/tests.py to facilitate poll creation in other methods
Added class PollViewTests in polls/tests.py with multiple methods to test index() in polls/views.py
Added class PollIndexDetailTests in polls/tests.py with multiple methods to test detail() in polls/views.py