admin-ui: Update jquery (v1.7.2 -> v1.11.0 min)
admin-ui: Add dataTables plugin (v1.9.4 min)

To be used for paginate, search and filter tables content.
admin-ui: Add sass file and unify the custom css

In the file extra.css are now included the most recent design updates.
admin-ui: Update view and functionality of items list