CI: BrowserStack not working

[ryan-roemer]

Not erroring Travis, but definitely failing:

11 01 2017 21:10:36.515:INFO [launcher]: Launching browsers bs_firefox, bs_chrome, bs_ie_10, bs_ie_11 with unlimited concurrency
BrowserStackTunnel: binary not present
11 01 2017 21:10:36.543:ERROR [launcher]: Cannot load browser "bs_firefox"!
  Error: Username is required.
  at ApiClient.BaseClient (/home/travis/build/ryan-roemer/backbone-testing/node_modules/browserstack/lib/client.js:18:9)
  at ApiClient.ApiBaseClient (/home/travis/build/ryan-roemer/backbone-testing/node_modules/browserstack/lib/api.js:9:13)
  at new ApiClient (/home/travis/build/ryan-roemer/backbone-testing/node_modules/browserstack/lib/api.js:162:17)
  at Object.createClient (/home/travis/build/ryan-roemer/backbone-testing/node_modules/browserstack/lib/api.js:278:10)
  at createBrowserStackClient (/home/travis/build/ryan-roemer/backbone-testing/node_modules/karma-browserstack-launcher/index.js:112:20)
  at Array.invoke (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:75:15)
  at Injector.get (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:48:43)
  at Injector.get (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:54:19)
  at get (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:54:19)
  at /home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:71:14
  at Array.map (native)
  at invoke (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:70:31)
  at Array.instantiate (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:59:20)
  at Injector.get (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:48:43)
  at module.(anonymous function) (/home/travis/build/ryan-roemer/backbone-testing/node_modules/karma/lib/config.js:244:62)
  at Array.invoke (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:75:15)
  at Injector.get (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:48:43)
  at /home/travis/build/ryan-roemer/backbone-testing/node_modules/karma/lib/launcher.js:69:76
  at /home/travis/build/ryan-roemer/backbone-testing/node_modules/karma/lib/launcher.js:136:49
  at Array.forEach (native)
  at Launcher.launch (/home/travis/build/ryan-roemer/backbone-testing/node_modules/karma/lib/launcher.js:135:13)
  at Injector.invoke (/home/travis/build/ryan-roemer/backbone-testing/node_modules/di/lib/injector.js:75:15)
  at Server.<anonymous> (/home/travis/build/ryan-roemer/backbone-testing/node_modules/karma/lib/server.js:180:24)
  at Server.g (events.js:291:16)
  at emitNone (events.js:86:13)
  at Server.emit (events.js:185:7)
  at emitListeningNT (net.js:1285:10)
  at _combinedTickCallback (internal/process/next_tick.js:71:11)
  at process._tickCallback (internal/process/next_tick.js:98:9)