Set default for options in run().

Fixes error when running tests directly.

Author: cloudhead

lib/vows/suite.js

@@ -204,6 +204,8 @@ this.Suite.prototype = new(function () {
     this.run = function (options, callback) {
         var that = this, start;
 
+        options = options || {};
+
         this.matcher  = options.matcher  || this.matcher;
         this.reporter = options.reporter || this.reporter;