Attach mousemove/end events to document, not window. Fixes IE9 and IE10 compat.

IE8 is hopeless; doesn't work with React anyway.

Author: STRML

lib/draggable.js

@@ -472,8 +472,8 @@ module.exports = React.createClass({
 
   componentWillUnmount: function() {
     // Remove any leftover event handlers
-    removeEvent(window, dragEventFor['move'], this.handleDrag);
-    removeEvent(window, dragEventFor['end'], this.handleDragEnd);
+    removeEvent(document, dragEventFor['move'], this.handleDrag);
+    removeEvent(document, dragEventFor['end'], this.handleDragEnd);
     removeUserSelectStyles(this);
   },
 
@@ -541,8 +541,8 @@ module.exports = React.createClass({
 
 
     // Add event handlers
-    addEvent(window, dragEventFor['move'], this.handleDrag);
-    addEvent(window, dragEventFor['end'], this.handleDragEnd);
+    addEvent(document, dragEventFor['move'], this.handleDrag);
+    addEvent(document, dragEventFor['end'], this.handleDragEnd);
   },
 
   handleDragEnd: function (e) {
@@ -562,8 +562,8 @@ module.exports = React.createClass({
     this.props.onStop(e, createUIEvent(this));
 
     // Remove event handlers
-    removeEvent(window, dragEventFor['move'], this.handleDrag);
-    removeEvent(window, dragEventFor['end'], this.handleDragEnd);
+    removeEvent(document, dragEventFor['move'], this.handleDrag);
+    removeEvent(document, dragEventFor['end'], this.handleDragEnd);
   },
 
   handleDrag: function (e) {