Flash-flood

List journals starting from know journal id (37)

Refactored flash-flood interface (32)
Add tests for objects and identifiers (31)
Add exceptions module (30)
Add interface classes to object IDs (29)
Add interface classes to journals and updates (28)
Add S3 key index (26)
Small updates to utility methods (27)
Add listing utility method, extend utility tests (24)
Add status output to event journaling and update (23)

Eventually consistent update/delete (22)
Ensure root prefix doesn't end with "/" (21)

Add event_exists method (20)

Journal based on events count and size (19)

Pass in s3 resource during instantiation (18)
More meaningful name for event data offset (17)
Turn on CI testing on travis (16)