Create an automated test suite

[brandonbaksh]

Is your feature request related to a problem? Please describe.
I don't have confidence in the test coverage of jenkins-timeline-plugin

Describe the solution you'd like
Create a complete and automated test suite for jenkins-timeline-plugin for java and javascript

[mcataford]

#17 covers Java tests, node tests to come when the node app is up. Putting this in blocked until then.

[mcataford]

Coverage added + added to CI as of #25