added test helper method create_question_comment
RED added test to check that when a question is deleted, the associated comments are deleted
GREEN added dependency destroy to for comments in the question model to pass test
RED added test to check that when question is deleted, all associated answers are deleted as well
GREEN added dependency to answers in question model to pass test
RED added test to check that when question is deleted, the comments associated with the answers associated with the question are also deleted
GREEN added dependency on comments in answer model to pass test
added test helper methods create_question_vote and create_answer_vote
RED added 2 tests to check that when question is deleted, the votes associated with the question, and the votes associated with the question answers are all deleted
GREEN added dependencies to votes in the question and answer models to pass test
Merge pull request #10 from mcivorsteiner/add_association_dependencies

Add association dependencies