data from spreadsheet

Pulls marker data from the spreadsheet at
https://docs.google.com/spreadsheet/ccc?key=0ArVHHOqS9VmBdEI1Rk4tMEhxd2pNb1ByYXNQbUJjV0E&usp=sharing

The "marker is invisible" problem was when the lat / long columns were interpreted as strings.