Make markers transparent and don't use translate for div adjustment (messes up dropzone alignment)
add rotation function and make icons only rotate 90 instead of in direction of motion
Simplify velocity history since don't need x,y history
Fix offset calculations for orginial-location recording
we don't care about velocity history after move is ended
added outline to icon dragged over zone
simplified code by removing cursor icon changes
Added ability for markers and icons to return to their starting location
improved appearance in css
clean up unused code
comments and debugging
html: removed bottom cancel zone and delete button, and bottom delete zone
add global vars and minor debugging
fixed crash if object speed unitialized
Prevent edge-triggering if we're dragging