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.
Nitpicking: My editor warns me about incomplete javadocs (missing return tag). As this is open code, I believe that we should try making it perfect :)