Added support for secure WebSockets

[CPlusPlus17]

My English is not the best, maybe you want to adjust the documentation to fit your standards. :)

[EnTeQuAk]

Hey @ManuelGysin - thanks a lot for the pull request!

I am actually not sure if we really want ssl support in omnibus directly. I'd rather see the documentation adapted with howtos to use nginx, apache etc as a https-proxy or an example using stunnel as a tunnel for local development.

Let me know what you think

[CPlusPlus17]

Hello!

To be honest, I'm not very familiar with websockets nor how to protect them the right way.
But in my opinion direct support would help to make the web a bit more secure, most people are not willing to install https-proxies or stuff like that and so they just skip the SSL part. (Deployment gets much more complex)

I can't estimate the impact of adding the SSL layer directly to omnibus. Sure there is some more CPU work to do but it will help to keep the deployment small. The other part is with omnibus and http-proxy in use the network debugging part could get much more complex.

[coveralls]

Coverage decreased (-1.65%) when pulling 441824b on ManuelGysin:master into f3c453a on moccu:master.

[EnTeQuAk]

Thanks again for all the work you did. I'm going to close this in favor of #17 to give this topic a bigger picture.