Implement deleting todos

http://emberjs.com/guides/getting-started/deleting-todos/
Split template into a set of nested templates

http://emberjs.com/guides/getting-started/adding-child-routes/
Permit user to see only active todos

http://emberjs.com/guides/getting-started/show-only-incomplete-todos/
Permit user to see only completed todos

http://emberjs.com/guides/getting-started/show-only-complete-todos/
Allow navigating back to the list of all todos

http://emberjs.com/guides/getting-started/show-all-todos-again/