PYCBC-231: Use compact json encoding

Change-Id: Iab39d45cfce9ea62314ff8643d4ab099c04ddc16
Reviewed-on: http://review.couchbase.org/36565
Reviewed-by: Dave Rigby <daver@couchbase.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>