feat(useQuery): accept client option

[alexkirsz]

Fixes #85.

I chose to preserve hooks invariants by still calling the useApolloClient hook despite the Apollo client being passed from the options.

I also implemented the same behaviour for useMutation and useSubscription.

This allows for creating custom hooks that address a specific client, e.g.:

function useBooksQuery(query, options) {
  const booksClient = useContext(BooksClientContext);
  return useQuery(query, { client: booksClient, ...options });
}

[Jdender]

This would be extremely useful for multiple clients instead of having to mess around with the context.

[trojanowski]

Thanks @alexkirsz. Published with release v0.4.3.