Feature/multiple

This PR make the following changes : 

CLIENT
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- 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

- dynamic favicon when showing application in an iframe

- couples style fixes

SERVER
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- require password before changing password (fix #1) (with tests)

- allow to start and stop an application (need tests)

- allow to install an application from a different branch (need tests ?)