Added the ability for the dev to choose which edge(s) that the ChatHead will snap

[pedrovieira]

Now the developer can choose which edge(s) that the ChatHead will snap: CHSnappingEdgeBoth, CHSnappingEdgeRight and CHSnappingEdgeLeft. To set which edge you want to use, simply call

_draggingCoordinator.snappingEdge = CHSnappingEdgeBoth;

_draggingCoordinator being the CHDraggingCoordinator.

Thanks!

[wangpeng1]

dynamic Added the ability for disappear and show CHDraggableView。 your app very cool,you can finished it same Facebook. thank you very much

[brutella]

Thanks