add awk script used in kddcup 2012 track 2 example.
fixed mhash() not to accept null as the argument.
changed the default mhash() range.
fixed a serious bug in logress.
"count" should be start with 1. Otherwise, eta could be INF.
avoid t be GT total_steps.
fixed a serious bug (w.r.t. count field) in logress.
fixed a serious bug in logress.