Improve the release script

  * Use git-archive, this removes all custom code to cleanup the repo, it
    can now be used in an unclean repo as the code will be exported from
    a specific tag.
  * Add parameters, this will allow using the script on any machine
    while keeping the default behavior for the maintainer.

Change-Id: I9f29d0e1afdbf475d0bbaeb9946ca3216f725e86
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>