admin-ui: Change expand arrow hover state style
admin-ui: Change modals style

Fix apyrgio/synnefo#127
admin-ui: Add title to <a> removing items from selection
Merge branch 'feature-admin-design' into feature-admin
admin: Load separate JS files for each view type

Make the page more responsive by loading only the JS files needed. To do
this, we take advantage of the {% block custom-javascript %} that is
defined in base.html.

Note that common JS files such as jQuery and Bootstrap are defined in
base.html and are thus loaded in every page.
admin: Get cyclades/astakos stats with Ajax
admin: Change structure of charts.js
admin: Add total resource usage chart