Separate TodoList out into it's own folder

Separate Todo out into it's own folder

Separate Filter out into it's own folder

Implement active todo count

Implement clearing completed todos

Small refactor

Break up Update.elm

Don't allow adding empty todos

Use `Keyed.ul` for the todo list

Implement todo filtering

Remove unneeded messages

Make messages take Todo instead of TodoIdentifier

Implement removing a todo

Add deploy.sh

Implement completing a todo