Implement getLastSequenceId() method.
Add getMaxScore() and getMinScore() methods, remove getLastSequenceId() method from  KeyValueStoreSortedInterface.
Add tests for getMaxScore() and getMinScore() methods.
Merge pull request #2 from dickolsson/2353489-update_seq-and-instance_start_time-fields

Implement update_seq and instance_start_time fields for /{db} endpoint