Update jQuery.Watermark, add tests

jquery.watermark/jquery.watermark.d.ts

@@ -1,19 +0,0 @@
-// Type definitions for Watermark plugin for jQuery 3.1.4
-// Project: http://jquery-watermark.googlecode.com
-// Definitions by: https://github.com/anwarjaved
-// Definitions: https://github.com/borisyankov/DefinitelyTyped
-
-
-/// <reference path="../jquery/jquery-1.8.d.ts"/>
-
-
-interface WatermarkOptions {
-    className?: string; // Default class name for all watermarks
-    useNative?: bool; // If true, plugin will detect and use native browser support for watermarks, if available. (e.g., WebKit's placeholder attribute.)
-    hideBeforeUnload?: bool; // If true, all watermarks will be hidden during the window beforeunload event.
-}
-
-
-interface JQuery {
-    watermark(text : string, options?: WatermarkOptions): JQuery;
-}