Allow appcfg rollback via module command gae:rollback about play-gae HOT 2 CLOSED

if command == "gae:rollback":
    print '~'
    print '~ Performing Rollback'
    print '~ ---------'

    if os.name == 'nt':
        os.system('%s/bin/appcfg.cmd rollback %s' % (gae_path, war_path))
    else:
        os.system('%s/bin/appcfg.sh rollback %s' % (gae_path, war_path))

    print "~ "
    print "~ Done!"
    print "~ "
    sys.exit(-1)