Adding Heartbleed detaction support

[bararchy]

I found this check using ruby: https://github.com/xlucas/heartbleed/blob/master/src/run.rb
If someone wants (know how) to implement this in the scanner this will be great :)

[bararchy]

@ik5 Would you be able to find a sec to do this ? (too much C like code for me to understand what the hell is going on there)

[ik5]

I'll try to do it this weekend, no promises.