Rename production files for distribution.
Rename package from DistortableImageLayer to DistortableImage.
Rename #_changeMode to #_toggleMode.
Remove ImageMarker (custom icons are set in the options for RotateHandle and WarpHandle instead).
Play around with layerPoint vs containerPoint to try to fix bug w/ overlay drag and then map translation.
Fix bug where the image overlay would jump when you (1) dragged the map (2) started to drag the image overlay. Fixed by changing all #latLngToX from ContainerPoint to LayerPoint in dragging._updatePosition.
Fix bug where the zoom animation was causing the image overlay to slide off the map when there had been a previous map translation. (Changed containerPoint to layerPoint).
Add regression tests for jerky/out-of-sync UI behavior (map draggin combined with operations on the image overlay).
Change the name of the distribution js file for production.