Updating travis builds to use headless firefox

.travis.yml

@@ -2,5 +2,8 @@ language: node_js
 node_js:
   - "4.1"
 before_script:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
   - npm install -g gulp
+  - sleep 3
 script: gulp verify

karma.conf.js

@@ -5,13 +5,7 @@ module.exports = function(karma) {
   var globs = _.flatten([
     config.globs.js,
     config.globs.spec
-  ]),
-    browser = 'Chrome';
-
-  if (process.env.TRAVIS) {
-    globs.unshift('node_modules/babel-polyfill/dist/polyfill.js');
-    browser = 'PhantomJS';
-  }
+  ]);
 
   karma.set({
     frameworks: ['browserify', 'jasmine'],
@@ -23,7 +17,7 @@ module.exports = function(karma) {
     reporters: ['progress', 'notify'],
     colors: true,
     logLevel: karma.LOG_INFO,
-    browsers: [browser],
+    browsers: ['Firefox'],
     autoWatch: true,
     singleRun: false,
     browserify: _.extend({

package.json

@@ -33,10 +33,9 @@
     "jasmine-core": "^2.4.1",
     "karma": "^0.13.14",
     "karma-browserify": "^5.0.2",
-    "karma-chrome-launcher": "^0.2.2",
+    "karma-firefox-launcher": "^1.0.0",
     "karma-jasmine": "^0.3.1",
     "karma-notify-reporter": "^0.1.1",
-    "karma-phantomjs-launcher": "^0.2.2",
     "lodash": "^4.6.1",
     "node-bourbon": "^4.2.3",
     "snapsvg": "^0.4.0",