AETV - new service

It seems that things have settled down on their website. I have not yet looked into what would be necessary to support their "Classics" or "Lifestyle" sections.

Closes #240

I had to import some modules in order to work out the url-signing. Specifically, "binascii", "hmac" and "sha". If that's a problem, then we'll probably need some help from @jam to make ir work.