Create some Openbox release scripts

Create some Openbox release scripts

release/bugs: Prints a list of bugs that are mentioned in git commits for a
  git revision, since previous release.
  - Very useful for updating the CHANGELOG file!

release/go: Tests a git revision for correct compilation, and prepares files
  for release.
  - Makes the tarball
  - Makes a GPG signature for the tarball
  - Tags the release
  - Spits out URLs to edit and gives the changelog for copy/paste.

release/email: Sends an email to the Openbox mailing list with the changelog
  and details about the release.  Call this with the same parameters used for
  running release/go once it is finished, and the files are uploaded, etc.
  - Also emails mikachu re freshmeat.net