Document `sample_date`, `end_date`, `start_date`, etc.
Document the `enabled` flag
Merge pull request #8 from openc/date-documentation

Document `sample_date`, `end_date`, `start_date`, etc.
Merge branch 'master' into simple-openc-bot
Commit larger transactions. Significantly speeds up SQLite
allow `store_fields` class method to be called more than once
On update, test if indices have changed and rollback if so.
Ensure we store database in bot directory
Update README so people can try out instructions direct from the `simple-openc-bot` branch