feat(liveblog): initialisation code for frontend

I have two solutions for this
a) if it starts with a /w character then let's assume it is a not fully path  and add the script prefix

ex:
asset.templateUrl('superdesk-users/activity/thumbnail.png');
vs
asset.templateUrl('/images/avatar_64.png');

b) if it starts with superdesk*
ex:
asset.templateUrl('superdesk-users/activity/thumbnail.png');
vs
asset.templateUrl('images/avatar_64.png');