Unformatted data field for UniqueCountReducer

[lcjohnso]

Expected Behavior: UniqueCountReducer (and SqsReducer) should return data formatted as a hash.

Current Behavior: unlike other Reducers, the UniqueCountReducer does not return a key-value hash in its data field. The same issue applies to SqsReducer, which returns "dispatched" in data when no other data field or hash is provided.

Consequences: Many pieces of Caesar code assume that a reduction's data will be a hash. As a result: exports fail, views fail, reduction results can't be accessed by rules, etc.

Potential Solution: For UniqueCountReducer, the update could be as simple as adding a key (e.g., count) for the returned value, and return key-value pair as a hash for the reduction's data.