Add SSL certificate to SignallingServer

Currently, the streaming page is available under http://streaming.akustik.rwth-aachen.de which lacks the ever-so-importand "s" from https. This should be fixed asap to convey seriousness when running first public tests.

• A certificate can be obtained through RWTH. Ask Norbert about it
• Currently, only port 80 is open. You will need to request opening port 443 (https standard port) through Norbert as well
• You will need to configure the Signalling Server to use the certificate: Under Server -> SignallingServer -> config.json set useHTTPS to true. Then you will need to put the certificate file(s) into the right location.

Important

Add the certificate files to gitignore and don't push them to the repository!