Added Aaron Parecki's gist of an Apache redirect

This came up in [webfinger/client.webfinger.net#2](https://github.com/webfinger/client.webfinger.net/issues/2#issuecomment-26295853) - Aaron Parecki made a nice gist of using `.htaccess` and a static file to set up personal Webfinger support using Apache alone. It's not "code" exactly, but I think it belongs here among a suite of tools to make setting up Webfinger support easier.