Refractored the generate_feed_json method to push more logic into the SQL call (for speed) and to limit the amount of results sent to the client (to let d3 draw things faster)
Refractored to remove the need for zoning.

Refractored to return entries based on both lat and lon. This required a change what was being receieved from the client, a change of the route, a slight change to the static_controller#feed action, a change to the prepare_for_launch and generate_feed_json actions.
Removed zone column, since it is redundant
Merge branch 'kill_zone'