Progress towards graduation

[Roman Shaposhnik]

Hi!

based on the discussion that happened on privated@madlib
I've updated the PMC roster and a PMC Chair position:
    https://cwiki.apache.org/confluence/display/MADLIB/Graduation+Resolution

I'd like to ask everyone to read through this doc once more
and let me know if something is missing.

Also, I need all those who are currently committers on
MADlib but are NOT on the PMC to reply to this thread
if they wish to keep being committers on the project.

Thanks,
Roman.