Takes in BaseStation-like output and produces a graph of all positions captured.

1. Capture SBS output into a file. For example, nc localhost 30003 | grep '^MSG,3' > capture.csv.
2. Graph it: ./draw_graph.py capture.csv will produce a file named map.png in the current directory.

BaseStation output documentation: http://woodair.net/SBS/Article/Barebones42_Socket_Data.htm