Indicate that findQuery isn't supported yet.

Without this override, the adapter inherits RESTAdapter's behavior, which
results in seemingly random XHRs when `store.find(type, query)` is used.

Ref: nolanlawson/ember-pouch#7.
Merge pull request #15 from humanpractice/query_not_supported

Indicate that findQuery isn't supported yet
1.1.1