check the usage of the logging framework

[booo]

var log = require('log4js')().getLogger('testing')
log.debug("a message ", " from good")

At some points we use statements like the one above for logging. This does not work for me. Perhaps this is a functionality from the old logging framework? One example: https://github.com/osm-spline/xappy.js/blob/master/lib/xappy.js#L136

[slomo]

problem will be fixxed after #116