configure Travis continuous integration

It will run gulp karma:single , and fail if that fails.

.travis.yml

@@ -0,0 +1,6 @@
+language: node_js
+node_js:
+  - "4.1"
+before_script:
+  - npm install -g gulp
+script: gulp karma:single

karma.conf.js

@@ -5,7 +5,13 @@ 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'],
@@ -17,7 +23,7 @@ module.exports = function(karma) {
     reporters: ['progress', 'notify'],
     colors: true,
     logLevel: karma.LOG_INFO,
-    browsers: ['Chrome'],
+    browsers: [browser],
     autoWatch: true,
     singleRun: false,
     browserify: _.extend({

package.json

@@ -36,6 +36,7 @@
     "karma-chrome-launcher": "^0.2.2",
     "karma-jasmine": "^0.3.1",
     "karma-notify-reporter": "^0.1.1",
+    "karma-phantomjs-launcher": "^0.2.2",
     "lodash": "^3.10.1",
     "node-bourbon": "^4.2.3",
     "snapsvg": "^0.4.0",