This is a Heroku buildpack for adding catdoc to your application.
Typically you'll want to use this with multipack, like so:
$ cat .buildpacks
https://github.com/heroku/heroku-buildpack-nodejs.git
https://github.com/leppert/heroku-buildpack-catdoc.git
$ heroku config:add BUILDPACK_URL=git://github.com/ddollar/heroku-buildpack-multi.git