Handle comma delimited locations.

[jmhobbs]

I decided to look at the code after filing #122, this seems to work fine.

[stevekinney]

I want to merge this, but there is a conflict—could you rebase?

[jmhobbs]

Done!

However, I'm concerned there is a bug in there now. I re-ran map_readme.rb and I saw duplicate geocoder requests for the same address for some locations;

Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=254+Crown+St%2C+Santa+Monica__&language=en&sensor=false
Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=254+Crown+St%2C+New+Haven&language=en&sensor=false
Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=254+Crown+St%2C+South+Bend&language=en&sensor=false
Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=254+Crown+St%2C+NYC&language=en&sensor=false
Geocoder: HTTP request being made for http://maps.googleapis.com/maps/api/geocode/json?address=254+Crown+St%2C+Dar+Es+Salaam&language=en&sensor=false

I think there is something up in the city matching code, but I'm not sure how to grok that.