Update to WS 6.x and fix all it broke

Significant update to the ws module to get it completely up to date.

The jump from 1.x to 6.x has required a rewrite of our WS handling. Most
specifically the means by which you can have multiple ws servers on a
single http server has completely changed; we now have to handle the
'upgrade' event on the server ourselves.

package.json

@@ -70,7 +70,7 @@
         "sentiment": "2.1.0",
         "uglify-js": "3.4.9",
         "when": "3.7.8",
-        "ws": "1.1.5",
+        "ws": "6.1.2",
         "xml2js": "0.4.19"
     },
     "optionalDependencies": {