Add history.js to 3rd party js libraries
Add history js to require
Use history js to change history state when moving map

This uses history js to change the url based on map zoom/pan
Add functionality to check if lat+lng in url is geolocated or not

This fixes a problem where the user browses back to the page with
a url with lat+lng, but that lat+lng does not represent a geolocated
position. History.js sets a data object in history that is checked
when loading a page. If this data object is present and not undefined,
we know that that the point in the url does not represent a geolocated
position.
Add History.js to require config
Fix url/javascript for back button on starred page
Bump leaflet
Syntax change as per Bennet's suggestion
Merge pull request #294 from notthatbreezy/topic/historyjs

Topic/historyjs
Merge pull request #295 from bhuber/topic/bump-leaflet

Topic/bump leaflet