Fixed valerie.d.ts

re-added missing reference for knockout

valerie/valerie.d.ts

@@ -1,9 +1,10 @@
+
 // Type definitions for valerie
 // Project: https://github.com/davewatts/valerie
 // Definitions by: Howard Richards <https://github.com/conficient>
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
-
+/// <reference path="../knockout/knockout.d.ts" />
 
 /**
  *