switched to more standard .textContent property to get node text

-Subproject commit a13ffd86fd88a9f0f82ddcec38fc121ca2554001
+Subproject commit c17e8c952e7405d3cf6f78cafb1539ad0b16c59d

@@ -349,7 +349,7 @@ Casper.prototype.debugHTML = function debugHTML() {
  */
 Casper.prototype.debugPage = function debugPage() {
     this.echo(this.evaluate(function _evaluate() {
-        return document.body.innerText;
+        return document.body.textContent || document.body.innerText;
     }));
     return this;
 };

@@ -165,7 +165,7 @@
             var text = '', elements = this.findAll(selector);
             if (elements && elements.length) {
                 Array.prototype.forEach.call(elements, function _forEach(element) {
-                    text += element.innerText;
+                    text += element.textContent || element.innerText;
                 });
             }
             return text;

@@ -355,8 +355,8 @@ var Tester = function Tester(casper, options) {
      */
     this.assertTextExists = this.assertTextExist = function assertTextExists(text, message) {
         var textFound = (casper.evaluate(function _evaluate() {
-            return document.body.innerText;
-        }).indexOf(text) != -1);
+            return document.body.textContent || document.body.innerText;
+        }).indexOf(text) !== -1);
         return this.assert(textFound, message, {
             type: "assertTextExists",
             details: "Text was not found within the document body textual contents",