Typo in app.tsx importing TodoModel from ./TodoModel. (#1609)
Typo in app.tsx importing TodoModel from ./TodoModel. (#1609)

Compiling as downloaded (with `tsc -p js/`) yields the following error:
```
js/app.tsx(12,27): error TS2307: Cannot find module './TodoModel'.
```
colingourlay/todomvc,silentHoo/todomvc-ngpoly,michalsnik/todomvc,podefr/todomvc,oskargustafsson/todomvc,colingourlay/todomvc,slegrand45/todomvc,michalsnik/todomvc,slegrand45/todomvc,slegrand45/todomvc,meligatt/todomvc,slegrand45/todomvc,silentHoo/todomvc-ngpoly,podefr/todomvc,oskargustafsson/todomvc,michalsnik/todomvc,colingourlay/todomvc,podefr/todomvc,slegrand45/todomvc,meligatt/todomvc,silentHoo/todomvc-ngpoly,slegrand45/todomvc,oskargustafsson/todomvc,meligatt/todomvc