Add sign out button
Show new post button to users that can create posts
Add test for category name uniqueness constraint
Add uniqueness constraint and validation to category names
Remove seeds and move FactoryGirl and Faker
Install Paperclip and AWS SDK
Configure Paperclip
Add Figaro
Create PostImage model
Create associations between posts and post images
Add has_attached_file to PostImage
Add image upload to post form
Make posts#create handle an image upload
Add display:block to inputs and labels
Fix CanCan's ForbiddenAttributesError