small fixture change for couchbase compatability

if a database doesn't easily allow for sorting by time of entry, and instead enforces
sorting by id ascii value (*cough* couchbase *cough*), then an id of 12345 makes following
test (query1) fail - because res[0] will doc with id 12345 instead of intended doc. 
Changing to zxy ensures no breaking changes for other stores, but allows couchbase store to pass
updating to latest
Merge pull request #1 from davidmarkclements/patch-1

small fixture change for couchbase compatability