Operations on Apps

According to #41 : 

I've made following methods : 

- Create an App
- Display the App (URL : /api/application/appname)
- Display All Apps
- Delete an App (thanks to its _id)
- Update an App (thanks to its _id)

Enhancements : Views

### Add Foundation Files

### Add an off canvas (http://foundation.zurb.com/docs/components/offcanvas.html#)