Add 3 Yokogawa SCADA vulns

These represent our part for public disclosure of the issues listed here:

http://www.yokogawa.com/dcs/security/ysar/YSAR-14-0001E.pdf

Yokogawa is calling these YSAR-14-0001E, and I believe that they map thusly:

  * YSAR-14-0001E Vulnerability 1 :: R7-2013-19.1
  * YSAR-14-0001E Vulnerability 2 :: R7-2013-19.3
  * YSAR-14-0001E Vulnerability 3 :: R7-2013-19.4

@jvazquez-r7 if you could confirm, I'd be delighted to land these and get your disclosure blog post published at:

https://community.rapid7.com/community/metasploit/blog/2014/03/10/yokogawa-centum-cs3000-vulnerabilities

Thanks for all the work on these!