add easing functions to jquery and jqueryui

jquery/jquery.d.ts

@@ -607,6 +607,16 @@ interface JQueryAnimationOptions {
     specialEasing?: Object;
 }
 
+interface JQueryEasingFunction {
+    ( percent: number ): number;
+}
+
+interface JQueryEasingFunctions {
+    [ name: string ]: JQueryEasingFunction;
+    linear: JQueryEasingFunction;
+    swing: JQueryEasingFunction;
+}
+
 /**
  * Static members of jQuery (those on $ and jQuery themselves)
  */
@@ -889,6 +899,9 @@ interface JQueryStatic {
     /**
      * Effects
      */
+
+    easing: JQueryEasingFunctions;
+
     fx: {
         tick: () => void;
         /**