Merge pull request #657 from mduvall/fix-forward-args

Fix forward args

@@ -366,7 +366,7 @@ Moves back a step in browser's history::
         console.log(this.getCurrentUrl()); // 'http://foo.bar/2'
     });
 
-Also have a look at ``Casper.forward()``.
+Also have a look at `forward()`_.
 
 .. _casper_base64encode:
 

@@ -885,7 +885,7 @@ Casper.prototype.fillXPath = function fillXPath(formSelector, vals, submit) {
  *
  * @return Casper
  */
-Casper.prototype.forward = function forward(then) {
+Casper.prototype.forward = function forward() {
     "use strict";
     this.checkStarted();
     return this.then(function _step() {