add editorconfig & jshint.

I know these crazy change sets aren't fun. Sorry :(

This PR introduces [editorconfig](http://editorconfig.org) and [JSHint](http://jshint.com). The configuration files are at root level, then I went through and ran it against the code, which is how we got to the huge diff. There are some things I'm not crazy about; mainly the 80 character limit. There are a few cases in here where splitting into a new line just makes things ugly.

I hate to even say this, being that the diff is so huge, but this is still just an initial "sweep." There are other code-style things that I think can still be addressed.

Please take a look. You'll notice lots of new lines, semi-colons, variable renaming, variable declaring, `use strict` atop every file, and other small things. I'm happy to tighten or loosen any of these rules and go back over the code.
>  The camelcase requirement is solely to prevent us and future contributors from naming things like the_results alongside theResults

That's why we need to explicitly turn off stricters for each individual case rather than turning them off for the entire file. Is that even possible? How do you annotate jshint for specific hunks?