extract the BUILDPACK_VERSION into it's own file
setup path so requires work when just requiring language_pack
rake task to increment BUILDPACK_VERSION number
use ruby-git
add rake tasks for checking if the changelog exists and staging a buildpack tarball
task to tag releases
rake task to publish a buildpack
buildpack:tag task creates tag and pushes it
buildpack:release task
Merge pull request #194 from heroku/releasing

Rake Tasks for Release Management