Create the Micropost model
Validate the presence of user_id
Create an association between User and Micropost
Use a default scope to order microposts
Destroy dependent microposts when a user is destroyed
Add content validation
Add microposts to the profile page
Add microposts to the sample populator
Add styling for microposts
Add routes for micropost actions
Add a form for creating new microposts
Add the status feed
Add the ability to destroy posts