-Added handlebars.js, so I could...
-...add template for typeahead, so I could...
-...show the # of calories in the typeahead pulldown
-Saving off number of calories last entered for each Food
-Since the data we get back from User#list_foods changes between submits of the add serving form, now:
  *deleting and recreating the typeahead and Bloodhound js objects after add serving returns
  *added timestamp to that js request, to avoid browser caching the json coming back (which was happening, and was very annoying)
-Food model: added "last_unit_calories" property, gets updated on add_ref. Also added lots of comments.
-rake db:fixup -- moved over the code from db:make_foods, added code to update last_unit_calories