Added XMLHttpRequest code to call processRadarImages.cgi. This is probably ok, but processRadarImages.cgi needs more work (and index.html may as well). Right now, the cgi looks at a state's kml to figure out what images to pull. The problem is that when index.html pulls kml to assemble a radar layer, the links in the state kml need to point to our processed radar images. It may make sense to create (or find) a static list of all radar sites by state to determine what radar image files to grab for processing, and then permanently change the kml files so they statically point to the locally stored cleaned up radar images. Issue #63.