move form into partial
ensure that user is logged in
add errors to Todo form and description field
render the description field accounting for newlines via Rails' simple_format method
add Todo state machine to keep track of todos that are,
- created
- started
- completed
protect user's Todo through create, update, delete
Merge pull request #7 from westonplatter/todos-forms

Todo forms, Todo StateMachine, and protect TodoController create, update, delete actions