WSS using React\Socket\SecureServer results in SSL_ERROR_NO_CYPHER_OVERLAP
Hi!

We're trying to get this TLS websocket running since last week. Everything worked fine without certificate. We've got a trusted certificate from letsencrypt.org and are trying to implement the secure connection with React\Socket\SecureServer (as suggested by @cboden at #500 [in this comment](https://github.com/ratchetphp/Ratchet/pull/500#issuecomment-329460941)). 

I know time is scarce, but can someone please help us out here?

Using cboden/ratchet v0.3.5, react/zmq v0.3.*
[server.php](https://pastebin.com/VEc9qMgU) (our setup is different as in #590 )

Connection at client with AutobahnJS v0.8.2
```javascript
	var conn = new ab.Session(wss://xxxx:8080,
		function() {
			console.info('Listening');
			
			// Listen for events.
			conn.subscribe('someThing', function(topic, data) {
			
			});
			
		},
		function() {
			console.log('Closed');
		}
	);
```
In console it shows 'Firefox can not connect with server at wss://xxxx:8080/'. And 'Closed'. At the netwerk tab we get the SSL_ERROR_NO_CYPHER_OVERLAP error. 


  