Implement a new start field for add queries.
Fix assertion.
Implement a start time field for edit queries.
Check for assignment to start date.
Implement parsing queries for editing the start time, ordering by start time, and filtering by start time.
Fix broken comparison.
Implement adding from..to
Implement accepting editing start dates of tasks.
Implemented start times in the controller.
Merge pull request #371 from lowjoel/implement-start-times

Implement start times in grammar and controller