[chore] Update zuul browser settings (#73)

- Remove deprecated iOS 7.1
- Add Firefox and Microsoft Edge browsers
- Add latest stable Node.js release

Author: darrachequesne

.travis.yml

@@ -1,10 +1,10 @@
 language: node_js
 sudo: false
 node_js:
-- 0.10
-- 0.12
-- 4.0
-sudo: false
+  - '0.10'
+  - '0.12'
+  - '4'
+  - 'node'
 notifications:
   irc: irc.freenode.org##socket.io
 matrix:
@@ -13,6 +13,8 @@ matrix:
     env: BROWSER_NAME=chrome BROWSER_VERSION=latest
   - node_js: '0.12'
     env: BROWSER_NAME=safari BROWSER_VERSION=latest
+  - node_js: '0.12'
+    env: BROWSER_NAME=firefox BROWSER_VERSION=latest BROWSER_PLATFORM="Windows 10"
   - node_js: '0.12'
     env: BROWSER_NAME=ie BROWSER_VERSION=6
   - node_js: '0.12'
@@ -26,13 +28,11 @@ matrix:
   - node_js: '0.12'
     env: BROWSER_NAME=ie BROWSER_VERSION=latest BROWSER_PLATFORM="Windows 2012"
   - node_js: '0.12'
-    env: BROWSER_NAME=iphone BROWSER_VERSION=7.1
+    env: BROWSER_NAME=microsoftedge BROWSER_VERSION=13 BROWSER_PLATFORM="Windows 10"
   - node_js: '0.12'
     env: BROWSER_NAME=iphone BROWSER_VERSION=8.4
   - node_js: '0.12'
     env: BROWSER_NAME=iphone BROWSER_VERSION=9.2
-  # - node_js: '0.12'
-  #   env: BROWSER_NAME=iphone BROWSER_VERSION=latest
   - node_js: '0.12'
     env: BROWSER_NAME=android BROWSER_VERSION=4.3
   - node_js: '0.12'