Build: update travis-ci for newer environments (#94)

Author: linuxwolf

.travis.yml

@@ -9,12 +9,13 @@ node_js:
 - '4'
 - '5'
 - '6'
+- '7'
 env:
   matrix:
   - CXX=g++-4.8 TASKS=test:nodejs
 matrix:
   include:
-  - node_js: 6
+  - node_js: 7
     env:
     - CXX=g++-4.8 TASKS=travis:browser
     addons:

gulpfile.js

@@ -182,7 +182,8 @@ var KARMA_CONFIG = {
     },
     "SL_Firefox": {
       base: "SauceLabs",
-      browserName: "firefox"
+      browserName: "firefox",
+      version: "51"
     },
     "SL_Safari_8": {
       base: "SauceLabs",