Merge pull request #10377 from Kovensky/patch-1

Add PureComponent definition (React 15.3)

react/react.d.ts

@@ -178,6 +178,8 @@ declare namespace __React {
             [key: string]: ReactInstance
         };
     }
+    
+    class PureComponent<P, S> extends Component<P, S> {}
 
     interface ClassicComponent<P, S> extends Component<P, S> {
         replaceState(nextState: S, callback?: () => any): void;