fixed #262 - Injecting clientScripts is not working

-Subproject commit 788879483f987f3a49401d1f817ae30745c06bd7
+Subproject commit e98991042dc266cbade70b3fe0dd612a7dfd273e

@@ -953,7 +953,7 @@ Casper.prototype.injectClientScripts = function injectClientScripts() {
         } else {
         } else {
             this.warn('Failed injecting %s client side', script);
             this.warn('Failed injecting %s client side', script);
         }
         }
-    });
+    }.bind(this));
     return this;
     return this;
 };
 };