Introduced AngularJS by converting VRF list page

Began introducing AngularJS to the NIPAP web UI by converting the
/vrf/list page. The implementation is currently a mixture between "old
and new" code; for example confirmation dialogs are not yet
"Angularified".

An Angular module for the entire NIPAP page is created and controllers
will be added for each page. A VRFListController was created to handle
the /vrf/list page.

As we're heading towards a web site which simply can't be used without a
JavaScript-enabled browser, I chose to remove things such as href
attributes on anhors which also have click event handlers in JavaScript
and will continue down that road.

Fixes #347 and fixes #338