Add FlashChat Arbitrary File Upload exploit module

Add FlashChat Arbitrary File Upload exploit module.

* Source: http://www.tufat.com/script2.htm
* Tested on version 6.0.8

![Add FlashChat Arbitrary File Upload](https://f.cloud.github.com/assets/434827/1274696/0df7de9e-2dc5-11e3-9259-b6cd15afee48.png)