add answers table and relations to questions
WIP: answers#create. Answers#new is done
Merge pull request #1 from anniesing/user-can-answer-q

add answers table and relations to questions
guest can add answers to questions
Merge pull request #2 from anniesing/user-can-answer-q

User can answer q
refactor tests and remove comments
Merge pull request #3 from anniesing/user-can-answer-q

refactor tests and remove comments
Merge pull request #6 from anniesing/master

user can answer questions