Stream changes for repos in a GitHub organization.

def org_stream(ctx, organization, github_url, github_token, clone_dir,
               verbose, filter, exclude, stream_uri, assume):
    """Stream changes for repos in a GitHub organization.
    """
    logging.basicConfig(
        format="%(asctime)s: %(name)s:%(levelname)s %(message)s",
        level=(verbose and logging.DEBUG or logging.INFO))

    log.info("Checkout/Update org repos")
    repos = ctx.invoke(
        org_checkout,
        organization=organization,
        github_url=github_url,
        github_token=github_token,
        clone_dir=clone_dir,
        verbose=verbose,
        filter=filter,
        exclude=exclude)

    log.info('Streaming org changes')
    change_count = 0
    for r in repos:
        change_count += ctx.invoke(
            stream,
            repo_uri=r,
            stream_uri=stream_uri,
            verbose=verbose,
            assume=assume)
    log.info("Streamed %d org changes", change_count)