Ianjorgensen/shadow

@jebeck  I got the drop shadow working and its looks great but it kills the scrolling performance. Im off to spend some time with my visiting family (from Argentina). https://trello.com/c/arBe3YZ3/227-refine-design-implementation-of-variable-circles. I have some ideas i want to try before giving up with it, but maybe you can think of something too. I want to try want happens if i only apply the drop shadow filter style after the elements are rendered.