Add Delete button + route in the server

Add Delete button + route in the server

Contact: joaquin@isla.io
Add DONE checkbox functionality

Add DONE checkbox functionality

Aprox. algorith of things to add:
1 - Add funcionality in html
2 - Add function in Controller
3 - Add method in the returning object in Factory
4 - Now we go to the server with:
        $http.get()
5 - Add route in server:
        app.post('/api/todos/done/:id', …
            Todo.update({},{}, function…
                if !err Todo.find(…res.json

Contact: joaquin@isla.io
Merge branch 'master' of heroku.com:sheltered-dawn-9351