Parse spatial view information

The supplied information for spatial views is different from the mapreduce
views. Insted of getting reduce functions, we receive the bounding box
that encloses the current view.

Change-Id: Ic8fe1a80366a2cd881d2264f6ca8f441b50b8ec3
Reviewed-on: http://review.couchbase.org/39631
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Dave Rigby <daver@couchbase.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>