Add Javascript Tests to Continuous Integration for the Hosted Context

[smcgregor]

The privly-applications bundle has Javascript tests, but they are not currently integrated into Travis, or any other continuous integration framework. While it is complicated to run the tests in the scripting environment of the browser extensions, it is standard to run these tests in a normal hosted context like the privly-web server. This issue is for running the Javascript tests inside Travis, a headless browser, or as a Grunt task.

Here is an explanation of how Javascript tests are currently written.

[smcgregor]

Done.