Feature/multiple

This PR make the following changes : 

- removed a couple of useless login-related files (see 5617e7a)

- various renaming in views/templates (home becomes main, applications become home, application "row" views are namespaced for market and home). 
- added navbar views/templates (extracted from home)
- added market views/templates

- change model so we can listen to it from various views

- use BaseView

- allow to start and stop an application (with tests)

- allow to install an application from a different branch (need tests ?)

- dynamic favicon when showing application in an iframe

- couples style fixes