Add example of 'item' API
Add example of 'item' API

Change-Id: I5a7062b636a007b55d374e44f163205faa007ef6
Reviewed-on: http://review.couchbase.org/29303
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

couchbase/couchbase-python-client,couchbase/couchbase-python-client,mnunberg/couchbase-python-client,mnunberg/couchbase-python-client