www: Added AngularJS version of add VRF-page

Added an AngularJS version of the add VRF-page. Templates prepared for
reuse on edit VRF-page.
www: Added AngularJS version of edit VRF-page

What the title says.
www: Link to AngularJS-versions of VRF pages

Changed the links to the VRF add and edit pages to point to the
new AngularJS versions.

Fixes #635
Merge pull request #640 from garberg/635-angularify_vrf

Angularified VRF add & edit pages
"no VRF" is now called "default"

.. although it can be renamed, so let _get_vrf also return the true name
of it.
Merge branch 'master' of https://github.com/spritelink/NIPAP
upstream merge