Merge pull request #35 from jpochyla/master

Use ClientUtils.findOne instead of document.querySelector in the Casper.fill method

@@ -473,7 +473,7 @@
             // Form submission?
             if (submit) {
                 this.evaluate(function(selector) {
-                    var form = document.querySelector(selector);
+                    var form = __utils__.findOne(selector);
                     var method = form.getAttribute('method').toUpperCase() || "GET";
                     var action = form.getAttribute('action') || "unknown";
                     __utils__.log('submitting form to ' + action + ', HTTP ' + method, 'info');