fix to issue reported by certik

the issue "Stacktrace at /todo/" reported by certik can be fixed by pulling my copies of email.html and todo.html

line 50 of todo.html was changed from {{ url_for('add_todo') }} to {{ url_for('views.add_todo') }}

the same issue in email.html can be fixed by changing line 61 from{{ url_for('email_someone') }} to {{ url_for('views.email_someone') }}