DDF-894 - Added "no-value" facets to all calculated facets

-added abilty to facet on "No Value" fields.  There are , however, some
hard-coding of metadata-content-type going on but for the most part its
generic.
-added grunt "dev" task to help speed up my starting and stoping of my
server without having to do a full bower install.  Saves devs alot of
time.
-added sorting to the metadata-content-type facet list.  No value should
be on the bottom and the rest are sorted by name.
No-value is fine but I wonder if null would be better.  Thoughts?