Added file mysqldb.py in the hope of removing dependency on MySQLDb.py. The mysqldb.py adds a thin layer to pymysqldb, which we are already requiring in json_to_relation code. No attempt made to integrate mysqldb.py into extract.py, though.
Merge branch 'master' of github.com:Stanford-Online/forum_etl. Datastage was behind, b/c some dev happened on Mono.