Add Glossword Arbitrary File Upload Vulnerability exploit

Add Glossword Arbitrary File Upload Vulnerability exploit module.

* Homepage: http://glossword.biz/
* Source: http://sourceforge.net/projects/glossword/
* Tested on:
  * Version 1.8.8  - Ubuntu 12
  * Version 1.8.9  - Ubuntu 12
  * Version 1.8.10 - Ubuntu 12
  * Version 1.8.11 - Ubuntu 12
  * Version 1.8.12 - Ubuntu 12