Make users own posts they make, display email on post
create comments & display them on posts
add validations, dependent: :destroy
User can create categories

User can create a category
User can view a category
User can edit a category they created

Added error partial to views/application
A user can delete categories he or she created.
Only users to vote
Allow users to switch votes
Destroying a post destroys all its votes
Account deletion destroys user votes