New Storage Format

- Changes to stream reader and flusher to accept new key format
being sent by projector.
- DocId no longer needs to be appended to key before storage.
Projector is sending it as part of secondary key.
- Missing Key will get deleted by UpsertDeletion Message
- Add Key Decoding
- Change query params to []byte for low/high param. This is
as per new format to be sent by DP4 catalog.

Change-Id: I060df63237f6dd0acea39b03a9ece4b0d605178a
Reviewed-on: http://review.couchbase.org/42838
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Tested-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>