Add testing framework

[rebstar6]

Needs a little research (or expertise) here. We need some kind of testing framework.
Unclear on how to unit test this, since it is just an API wrapper for vinyldns api. There seem to be a lot of unit testing API tools out there, would like whoever starts this up to laydown some opinions on the matter. If not, this looked interesting and it works with pytest which we use for the vinyldns api - https://github.com/taverntesting/tavern

whatever testing is added here should be tied into travis

AC:

• We have one function tested (pick any, say getRecordSet)
• That test is running travis

If the tests arent just copy/paste, we will make followup cards to test the other functions