Add XStatic-angular-* packages for Horizon

These packages are required by Horizon in order to move from jQuery to
AngularJS. These packages contains a bundle of the angular-bootstrap library
which is available here: http://angular-ui.github.io/bootstrap/, an improvement
for animation in angular, and an HTML sanitizer.

Further informations available here:
https://etherpad.openstack.org/p/juno-summit-horizon-static-files

Change-Id: I525f242967aa05b65bcecb911b433ef53c900450
Implements: https://blueprints.launchpad.net/horizon/+spec/horizon-angular
Merge "Add XStatic-angular-* packages for Horizon"