remove debug route; no longer necessary
prep for mobile

* index route simplified
  * no longer a need to store all pantries at bottom of page
* #content div is gone; less elements == more happy
* rename of key div's:
  * #mainHeader -> #header
  * #leftContainer broken up; won't really be 'left' for mobile
    * #search followed by #pantryList
* #searchIndicatorBar is gone
  * messages not super helpful + space is important for mobile
  * search() function replaced by underlying Backbone fn
* #pantryList scrolled to the top on getting new results
  * first result always the closest one to the center of the map
* #social moved towards the bottom, which will help page load perf
* minor CSS tweaks
make "fork me on GitHub" for desktop only

A simple media query that only hides the image for small screens
re-org of main.js: Backbone,Globals,Helpers,OnLoad
moving scrollTop to the PantriesView

as I'm slowly learning, the Backbone View should be the single place to
handle what happens to the DOM elements within its $el. This is where it
should have been before, really.
mobile-friendly, responsive design

First implementation of
https://github.com/codeforboston/pantry_pickup/issues/6