Dropdown doesn't close on click outside fix

Hi there,

Dropdown component doesn't close on click outside in my app. 
I debugged a little bit problem and found that componentWillUpdate uses incorrect.
It accepts nextProps and nextState and not prevState and nextState
https://facebook.github.io/react/docs/component-specs.html#updating-componentwillupdate

components/dropdown/Dropdown.jsx

@@ -34,8 +34,8 @@ class Dropdown extends React.Component {
     up: false
   };
 
-  componentWillUpdate (prevState, nextState) {
-    if (!prevState.active && nextState.active) {
+  componentWillUpdate (nextProps, nextState) {
+    if (!this.state.active && nextState.active) {
       events.addEventsToDocument({click: this.handleDocumentClick});
     }
   }