task/ta-npe-001-04 -- connote based jobitem extraction

nparcel/primaryelect.py
* refactor the PrimaryElect class so that it inherits from Reminder() as
  much of the functionality is similar

nparcel/table/jobitem.py
* new method connote_base_primary_elect_job() which provides an SQL
  wrapper to verify if a *connote* is associated with a primary elect
  job