Adding the Socrata dataset as the backend to LotLinker.

This makes the publicly accessible Socrata endpoint the backend
for the map datapoints. This exposed a few problems:
* There are some mis-geocoded points that show up as addresses outside of Dayton
* This takes a LONG time (several seconds) to load. We might want to find some way to reduce that thunk.

Fixes #3
Merge pull request #15 from DavidEBest/devel-socrata

Adding the Socrata dataset as the backend to LotLinker.