implement CI

[pkra]

Something along the lines of Travis and SauceLabs, possibly switching test runners to something more generic (e.g., Karma + Jasmine).

[pkra]

• Assumptions.
  • we want to build on Saucelabs (b/c it's free for open source projects).
  • we want to build on nodejs (b/c JavaScript)
• Consequence: saucelabs docs suggest two options
  • Mocha
  • Jasmine
  • what the cool kids say: Why is Jasmine used as default instead of Mocha? yeoman/yeoman#117
• So perhaps Mocha?
  • https://github.com/saucelabs/node-tutorials
• test runner
  • Karma as runner also works https://github.com/saucelabs/karma-sauce-example
  • Intern https://theintern.github.io/
  • Nightwatch also looks potentially nice. More independent of Saucelabs perhaps but compatible TEST beatfactor/nightwatch#1