use pmc data from postgres not couch
add json_sqlalchemy.py.  Thanks @dbarnett!

from https://gist.github.com/dbarnett/1730610
Merge branch 'master' into postgres
add rollback and logging on IntegrityError
start couch query at skip_till_key if 1 thread
remove extra logging
try releasing database in couch threads
whoops fix db import
fix typo to release