Added missing RawWidget

Fixes #298. Thanks to @buggyj for pointing it out.

core/modules/widgets/raw.js

@@ -0,0 +1,53 @@
+/*\
+title: $:/core/modules/widgets/raw.js
+type: application/javascript
+module-type: widget
+
+Raw widget
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+var Widget = require("$:/core/modules/widgets/widget.js").widget;
+
+var RawWidget = function(parseTreeNode,options) {
+	this.initialise(parseTreeNode,options);
+};
+
+/*
+Inherit from the base widget class
+*/
+RawWidget.prototype = new Widget();
+
+/*
+Render this widget into the DOM
+*/
+RawWidget.prototype.render = function(parent,nextSibling) {
+	this.parentDomNode = parent;
+	this.execute();
+	var div = this.document.createElement("div");
+	div.innerHTML=this.parseTreeNode.html;
+	parent.insertBefore(div,nextSibling);
+	this.domNodes.push(div);	
+};
+
+/*
+Compute the internal state of the widget
+*/
+RawWidget.prototype.execute = function() {
+};
+
+/*
+Selectively refreshes the widget if needed. Returns true if the widget or any of its children needed re-rendering
+*/
+RawWidget.prototype.refresh = function(changedTiddlers) {
+	return false;
+};
+
+exports.raw = RawWidget;
+
+})();