[theme-reviewers] Expanding the theme uploader checker

[Otto]

Okay, here's what I've got so far. Thanks to Simon's help, it now
checks for almost everything in the theme review criteria (at least
the stuff that can be automatically checked for).

http://ottodestruct.com/themecheck.zip

It's just a testbed, basically. The actual final code will be
drastically different in implementation. Upload it on a local
webserver to test. You'll need the php zip libraries installed. Works
fine with XAMPP as a test platform.

The only import part is the various checks, which are all in the
checks directory. Those probably won't change other than in minor
error reporting ways. There's 22 files there to do the grunt work,
most of which have multiple checks in them.

Feedback is appreciated.

-Otto