Remove direct psycopg2 dependency and let user decide which to use#14

vinceatbluelabs wants to merge 1 commit intojmcarp:masterjmcarp/sqlalchemy-postgres-copy:masterfrom

vinceatbluelabs:remove_psycopg2_dependencyvinceatbluelabs/sqlalchemy-postgres-copy:remove_psycopg2_dependencyCopy head branch name to clipboard