cwm_time, RDFSink minor fixes

I checked in a change to cwm_time.py because I got today's date as
'2003-49-01T....' and noted that Python's docs say %M is minutes, %m month
for time string formatting.  Changed gmTime function accordingly.

Also, RDFSink wasn't importing progress from diag, so I added it.

-- 
Ryan Lee
ryanlee@w3.org