Create test suite for CI

[RocketMan]

As maintainer, I want a set of tests to perform basic functional validation of the application. I want the tests to run automatically as part of Travis CI.

[RocketMan]

Library validation added in #279

We now have coverage over:

• authentication (login validation, session, and api key)
• playlist creation and edit
• library album creation, edit, and print queue
• library label creation and edit
• music review creation
• category validation

Still TBD:

• a-file add, edit
• chart creation