add a user model
create and authenticate users
Add Bootstrap gem
Update User model, add sass styles
Create Question model
Update db schema
Update Question model, add validation & associations
Add User & Question association specs
add question model and index view
Add AJAX new Question form
Update new question form, ajax redirect
Create Answer model
Add Answer specs, update User & Question associations
display answers on question show pages
Add AJAX answer form
add vote model
add specs for votes
rename 'votes' to 'vote_count' in database tables
Change vote_count to default 0
Add vote count display