changing chaco's MoveTool to import DragTool directly from Enable, and removing an unused attribute
changing chaco's MoveTool to import DragTool directly from Enable, and removing an unused attribute

ContinuumIO/chaco,burnpanck/chaco,tommy-u/chaco,ContinuumIO/chaco,tommy-u/chaco,ContinuumIO/chaco,burnpanck/chaco,tommy-u/chaco,burnpanck/chaco,ContinuumIO/chaco