Use project name from server info

[leplatrem]

In addition to #494 I propose that we use the project name value of the server root URL instead of having Kinto Admin and Kinto Web Administration Console in the UI.

We'll still have Powered by Kinto-Admin in the bottom

[leplatrem]

OH :(

https://github.com/Kinto/kinto/blob/d65ba3985ee2a39d77bc4d8f7cf4c310e9e9c4c4/kinto/__init__.py#L48