Added stroke serialization

jsketch.js

@@ -248,6 +248,7 @@
      */
     stroke: function() {
       this.context.stroke();
+      this.callStack.push({ method: 'stroke', args: [] });
       return this;
     },
     /**

jsketch.svg.js

@@ -187,6 +187,10 @@
         return '';
       },
     };
+    /**
+     * Alias of `closePath()`;
+     */
+    methods.stroke = methods.closePath;
 
     function build() {
       var svg = '<?xml version="1.0" encoding="utf-8" standalone="no" ?>';