[test] Update zuul configuration

Excluding tests on iphone / ipad / edge for the moment.

Author: darrachequesne

package.json

@@ -58,7 +58,6 @@
     "gulp-task-listing": "1.0.1",
     "istanbul": "^0.4.5",
     "mocha": "^3.2.0",
-    "socket.io-browsers": "^1.0.0",
     "webpack": "1.12.12",
     "webpack-stream": "^3.2.0",
     "zuul": "3.11.1",

zuul.config.js

@@ -1,8 +1,6 @@
 'use strict';
 
-var browsers = require('socket.io-browsers');
-
-var zuulConfig = module.exports = {
+const zuulConfig = module.exports = {
   ui: 'mocha-bdd',
 
   // test on localhost by default
@@ -29,5 +27,21 @@ if (process.env.CI === 'true') {
   };
 }
 
-var isPullRequest = process.env.TRAVIS_PULL_REQUEST && process.env.TRAVIS_PULL_REQUEST !== 'false';
-zuulConfig.browsers = isPullRequest ? browsers.pullRequest : browsers.all;
+zuulConfig.browsers = [
+  {
+    name: 'chrome',
+    version: 'latest'
+  }, {
+    name: 'firefox',
+    version: 'latest'
+  }, {
+    name: 'internet explorer',
+    version: '8..11'
+  }, {
+    name: 'safari',
+    version: 'latest'
+  }, {
+    name: 'android',
+    version: '5.1..6.0'
+  }
+];