Fixed insert() not using the standard document encoding utility.
Fixed insert() not using the standard document encoding utility.

Change-Id: Ie6b8a30a88af0c8883f7342ae662b81a40abfc32
Reviewed-on: https://review.couchbase.org/c/couchnode/+/177169
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Reviewed-by: Jared Casey <07fbe21933bc3411328c4385bc2be7d6649bbd1d@couchbase.com>

couchbase/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode