Adds model attributes for paperclip attachment
Creates migration for user#image
Moves up paperclip method
Allows user to upload a photo
Allows destruction of victory on Petition#destroy
Modifies AR SQL query in Petition model
Sets up paperclip correctly with image validation to prevent XSS
Creates User#image_from_url which sets a default image (condition will need to be modified)
Creates default image in UsersController when page is edited (need to fix up)
Adds User images to necessary views!