Added my parts!

- base64.js is a set of functions for encoding/decoding base64.
- getImage.js takes a search query and uses Bing to perform a search
- getImage is sanitized--an app key is needed for Bing to work.
Merge pull request #1 from Solumin/master

Here's my stuff. Add it! :D ~cat game~
Updated Contender class

Contenders march to the middle of the battlefield and then fight. Long
term, they should not know where the middle is, but for proof of concept
it's working. HP implemented, and base damage function.