Add bower file

Hi,

I'm not sure why it is that there's no bower file, but I've done the honour of creating one- let me know if the metadata looks alright. I've tested it against my fork and it seems to work fine. Will need to have a new 0.4.9 tag pushed for it to work properly, and if you guys could do a `bower publish` then I'd be a happy man :grinning:

Всем спасибо!