Remove initialStart state.

Causes problems when you intend to move an item back to its starting position and
doesn't actually accomplish its intended optimization goal.

Author: STRML

lib/draggable.js

@@ -483,8 +483,7 @@ module.exports = React.createClass({
 
   componentWillReceiveProps: function(newProps) {
     // React to changes in the 'start' param.
-    if (newProps.moveOnStartChange && newProps.start &&
-        (newProps.start.x !== this.state.initialStart.x || newProps.start.y !== this.state.initialStart.y)) {
+    if (newProps.moveOnStartChange && newProps.start) {
       this.setState(this.getInitialState(newProps));
     }
   },
@@ -525,9 +524,7 @@ module.exports = React.createClass({
       offsetX: 0, offsetY: 0,
 
       // Current transform x and y.
-      clientX: props.start.x, clientY: props.start.y,
-
-      initialStart: props.start
+      clientX: props.start.x, clientY: props.start.y
     };
   },