Fix password reset response

Parse as JSON the response of reset password
Redirect user to login page

When the user click on login redirect the user to the login page not to the root page.
Change the order of css file

The mobile.css must be the last file because it modify some style defined in other files
Improve mobile style
Correct reset page title
Improve messages service

Create a second type of message: session message.
Session messages are messages which are not removed when the page change.
Add removeObserverCallback

Add the possibility to remove an observerCallback.
Leave correctly the Paper

Remove the window status change callback when the user leave the page.
Merge pull request #64 from tdurieux/fix-leave-paper

[fix #56] Leave correcly the Paper
Merge pull request #63 from tdurieux/message-improve

Improve messages service