task/ta05 -- dbsession.py module setup

dbsession.py
tests/test_dbsession.py
* new files to support the dbsession module

utils/log.py
* removed the class_logger decorator as functools is not available
  in this version of Python
task/ta08 -- create "job" table ORM

dbsession.py
* tweaks to make the DB Session work with the new ORM structure
Merge branch 'feature/us21' into dev