Upgrade to Leaflet 0.7.1

The latest stable version as of this commit.
Upgrade to Leaflet.draw 0.2.3-dev

The latest in the master branch at the time of this
commit. I followed this guide to update the app to
use the new draw plugin API

https://github.com/Leaflet/Leaflet.draw/blob/master/BREAKINGCHANGES.md
Page formatting and JS cleanup

Looks nicer an works a bit better now.