#5 Reduce the number of items stored in the database.

[Graeme Muller]

All times are being stored as Joda Time DateTime objects. This means, the dates are included in all the times so there is no need to specifically add a date field to act as a primary key.

Also, a Period object can easily be created from two DateTime objects so there is no need to store the delta time either.

Proposed new schema = (startTime, stopTime, jira, description)