TLV Redux

Alright @adamvoncorswant, feel free to take a peek when you get a moment. Never before has there been such a test-covered parser :tada: 

FYI @linnie if you're interested. EMV stuff and all that.
Unmotivated empty line, that would be.

Sorry for the hassle. Do you want me to change the last pieces of the puzzle? Don't want you to spend too much time on this...