Add images to post show views
Add URL accessor to PostImage
Add attachment content validator to PostImage
Put config/application.yml in .gitignore
Add multiple image uploads
Prevent creation of empty post images
Add post edit buttons
Add some seed data
Fix edit links and form
Initialize category selection in post edit form
Wrap PostImage#file_file_name in PostImage#filename
Support deleting pictures
Insert post description into form
Fix bug when editing posts
Validate image sizes
Add Paperclip shoulda matchers
Add tests for PostImage validations
Validate presence of attachments for PostImage