Define scafold #clone() function for the classes that still required a proper definition.

src/item/PlacedSymbol.js

@@ -27,6 +27,11 @@ var PlacedSymbol = this.PlacedSymbol = Item.extend({
 			: new Matrix();
 	},
 
+	clone: function() {
+		// TODO: Implement!
+		return this.base();
+	},
+
 	_transform: function(matrix, flags) {
 		// In order to set the right context transformation when drawing the
 		// raster, simply preconcatenate the internal matrix with the provided

src/item/Raster.js

@@ -34,6 +34,11 @@ var Raster = this.Raster = Item.extend({
 		this.matrix = new Matrix();
 	},
 
+	clone: function() {
+		// TODO: Implement!
+		return this.base();
+	},
+
 	/**
 	* The size of the raster in pixels.
 	*/

src/project/Symbol.js

@@ -23,6 +23,11 @@ var Symbol = this.Symbol = Base.extend({
 		this.setDefinition(item);
 	},
 
+	clone: function() {
+		// TODO: Implement!
+		return this.base();
+	},
+
 	getDefinition: function() {
 		return this._definition;
 	},

src/text/PointText.js

@@ -23,6 +23,11 @@ var PointText = this.PointText = TextItem.extend({
 		this.matrix = new Matrix().translate(this._point);
 	},
 
+	clone: function() {
+		// TODO: Implement!
+		return this.base();
+	},
+
 	getPoint: function() {
 		return this._point;
 	},