Psycopg2_pool only cooperates with gevent, not meinheld

Explanation in comments.  Meinheld can't use psycopg2pool to for actual pooling.  It just opens one connection and can never cooperate with Meinheld's green threads or whatever you want to call them since it's not gevent.

Update:  Whoops.  Gotta patch psycopg2 explicitly.  Can do this in a variety of places.  Meinheld can patch psycopg2 this way:
https://gist.github.com/mopemope/27ab7bf20130208cbc73