Figuring out infowindows, also javascript scoping- need to figure out how to add infowindows to clickable features, not just markers.
Putting the infowindow where the click was is okay, maybe it would be better to get feature center though?
Using the test1.js as a model now have a map where each census tract is clickable and a population density and acreage will be displayed.  Next make the tract be highlighted when clicked.
Trying out forEachProperty from http://stackoverflow.com/questions/24144782/example-of-using-feature-foreachproperty-in-google-maps-javascript-v3 - probably don't actually want to use every property though.
Now have highlighting when a feature is clicked.