add node about pundit spec blocking rspec 3
add generated comments model
add CommentsController and code to render a new comment form
only show add comment link if logged in

add post_id/type to new comment link

add new_post_comment_url helper to dry params
Merge branch 'master' into comments

Conflicts:
	Gemfile
Merge branch 'master' into comments

Conflicts:
	app/models/user.rb
	db/schema.rb
Merge branch 'master' into comments
Add comments#create method
render comments on question pages
append the new comment form
render comments and add comment links on answers
add styling for comments
submit comments remotely
add permissions for creating comments
show comments in the correct ordering
add controller authorization
Merge branch 'comments'