Changed path.js to editme.js

I don't like having this link-automagic crap because then I have less power to customize things, but since it appears you can't nest gimmicks, I converted this to your standard linkGimmick.

`[gimmick:editMe(text:'Edit this File')](https://github.com/ProLoser/webshow/edit/gh-pages/)`

The `text` option is optional, the url is the prefix of the file path.