Submit pull request to Leaflet that fixes issue where move event is not triggered during map "throws" and "panBy" operations

[nateirwin]

This needs a bit more investigation. The event seems to fire at least a few times during pan animations, but it doesn't fire consistently enough to hook InfoBox repositions to. To put it scientifically, it "stutters" during the animation. The animation occurs in dom/PosAnimation.js (and presumably dos/PosAnimation.Timer.js for legacy browsers).

For now, NPMap (NPMap.Map.Leaflet) turns off inertia in the L.Map config and uses L.Map._rawPanBy when the InfoBox is displayed to work around this issue. If the InfoBox is not displayed, L.Map.panBy is used.