Fix Travis Sauce Tunnel Issues

Travis is failing because Sauce can't find the appropriate tunnelid.
This should fix that but setting the tunnel id to be the Travis
job number.

karma.conf.js

@@ -182,9 +182,11 @@ module.exports = function(config) {
   };
 
   if (useSauce) {
+    my_conf.captureTimeout = 0; // use SL timeout
     my_conf.sauceLabs = {
       testName: 'noVNC Tests (all)',
       startConnect: true,
+      tunnelIdentifier: process.env.TRAVIS_JOB_NUMBER
     };
   }