Added technical program committee, a place where we can acknowledge track cochairs

[jasongrout]

I was trying to acknowledge people directly involved in the parts of the conference on this page (tutorials, the in-conference program, etc.) - are there other people to add here?

On the other hand, perhaps we just restrict this to the listing of track co-chairs, since others are listed in the organizing committtee page?

[jasongrout]

Merged and ready for deployment, @SylvainCorlay