Patch to add video/ogg mime type to play videos in firefox

[patrick aljord]

This adds support for the "video/ogg" mime type so that firefox can
read theora videos using the html5 <video> tag instead of making the
user download the ogv file.

Here is the tiny commit:

http://github.com/bobesponja/rack/commit/0c630c81b44a9342ee178987af042b43b1123596