Refactor and add new tables/daos to Content Provider.

Changes includes:
- Add new Instances table to hold alarm state
- Add new Cities table to hold user selectable cities.
- Add delete_after_use column to Alarms table.
- Fix issue where alarmId was a int and not a long.
- Move Alarm related code to Alarm dao.
- Moved DaysOfWeek out of Alarm dao.

Change-Id: Idd578bb3668099ec8f4b30fbe9b62b06158ab406