Rex::SSLScan

Adds Rex SSLScan. You can create a scanner object with Rex::SSLscan::Scanner.new(host,port,timeout)

You can then scan the target by calling .scan
This will return a Rex::SSLScan::Result object

Calling .to_s on the Result object will provide output similar to the sslscan utility.

The PR also includes rspec tests for both classes.