make Maximum Concurrent Jobs configurable
Allow for using a different database than postgresql.

Though currently only the postgresql class is included in this module.
Merge pull request #8 from jasperla/maxjobs

make Maximum Concurrent Jobs configurable
Merge pull request #9 from jasperla/db_type

Allow for using a different database than postgresql.
Order for readability
Update test cases and readme to match reality
Lint
Merge pull request #11 from xaque208/testsomething

Testsomething
release 0.2.0
release 1.1.0
Update moduleversion for author change