NCBC-700: Add overload for Prepend/Append that accepts byte arrays

Change-Id: I4aa4d425c9dddb347667d2d045e8d3cd1bf72fb9
Reviewed-on: http://review.couchbase.org/42882
Reviewed-by: Jeffry Morris <jeffrymorris@gmail.com>
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>