Add ssl_version parameter

I had a problem connecting to my taverna server and i found that the problem was with tomcat and a good way to fix it was changing the ssl_version

http://blog.55minutes.com/2012/05/tls-error-with-ruby-client-and-tomcat-server/

I added the parameter to the options (code and executable files). 

Feel free to include it in your base repo if you like it. :)

Thanks a lot for your gem!  It is being very useful :))