Tweak key bindings for grid/tiles example.
Tweak key bindings for grid/tiles example.

Andrey-Pavlov/polymaps,AndBicScadMedia/polymaps,sfchronicle/mapsense.js,makinacorpus/polymaps,Cherchercher/polymaps,Laurian/mapsense.js,cksachdev/mapsense.js,mbostock/polymaps,Andrey-Pavlov/polymaps,simplegeo/polymaps,shkfnly/mapsense.js,dillan/mapsense.js,RavishankarDuMCA10/mapsense.js,manueltimita/mapsense.js,gimlids/mapsense.js,mapsense/mapsense.js