fix intro.js

intro.js/intro.js-tests.ts

@@ -9,11 +9,11 @@ intro.setOptions({
             intro: "Hello world!"
         },
         {
-            element: document.querySelector('#step1'),
+            element: document.querySelector('#step1') as HTMLElement,
             intro  : "This is a tooltip."
         },
         {
-            element : document.querySelectorAll('#step2')[0],
+            element : document.querySelectorAll('#step2')[0] as HTMLElement,
             intro   : "Ok, wasn't that fun?",
             position: 'right'
         },

intro.js/intro.js.d.ts

@@ -14,7 +14,7 @@ declare module IntroJs {
     interface Step {
         intro: string;
         element?: string|HTMLElement;
-        position?: Positions;
+        position?: string|Positions;
     }
 
     interface Options {