Created helpers folder to store all test case helper files
Updated tests.py to separate test cases

Separated test cases out form tests.py to test_utils.py and
util_test_helper.py
Updated utils.py to have more defensive code

Added a case where query returns None when there is no query string.
Test Driven Development of this method.
Fixed a bug where views.py imports dora.logic

dora.logic has already been renamed to dora.utils Updated views.py to
fix the bug.