Replace horizon.conf with an angular one

    Horizon configuration is now fully integrated into the angular
application. The object horizon.conf is still available in the
application in order to keep the compatibility, it is a link to the
angular constant object.

Change-Id: I55e1672a89a78032b24c096258471d0ea9d2489e
Implements: blueprint horizon-angular
Merge "Replace horizon.conf with an angular one"