The pomodoro user can configure these parameters in a specific windows :
- Working Time
- Short pause time
- Long pause time
- Count of iteration between 2 long pauses

From the settings part
  - when the user click on Save, the values entered are saved. He gets back to the pomodoro page.
  - when the user click on Cancel, he returns to pomodoro page

Warning : Currently the input from settings window are not validated

The user can use previous and next button from the browser

[AppModel]
- Add the application mode in this model (Pomodoro or Settings)
- Add the support of SettingsModel

[AppRouter]
- Component to manage routes (#settings and # )

[SettingsView]
- Add action on save and cancel buttons

[AppView]
- Add navigation using app.router
- use app_mode from model to know the view to diplay (pomodoro or settings)

[App.js]
- Instanciate multi view context
- Instanciate router