add skeleton of marker clustering
render returns unclustered markers and clusters
create markers with addMarker on success
set icon on markers and place on map
new results clear out all previous results
move sprite management into its own class
build out location manager
remove MapMarkers class and references
show clusters and dry code
use icon instead of deprecated markerimage
add onclick listeners to markers
use marker mean for cluster location
Merge branch 'cluster-many-results'