generated Micropost model
added index to microposts
added specs for microposts and run db:migrate to update schema
Added spec for micropost to check that it's invalid when the user_id is null
Added validation to Micropost model for user_id being present
added more specs for microposts and users
created relationships between users and microposts to pass tests
Added :micropost factory for testing and added micropost specs to the user_spec
Added default order for the microposts collection on users
added spec to make sure microposts are deleted when it's user is deleted
added dependent :destroy to the user model
Added specs for validating micropost.content
Added validation for :content
Added specs for microposts
Added @microposts to User#Show
Added microposts to users#show view
Added _microposts partial
Added microposts to sample_data take task
added microposts resource to routes
added css for microposts