Add methods for choice of returning with or without response.

This commit adds a method to return with a response, and a method to
return without of a response so it can be used with other handlers.
Change method name fetch_without_response to fetch_without_reply.

This commit changes the method name fetch_without_response to
fetch_without_reply, and fetch_with_response to fetch_with_reply to be
more descriptive.

[16114701367387](https://app.asana.com/0/16114701367387/16114701367387)
Merge pull request #2 from sqm/16114701367387-edit-lita-google-images-to-return-with-or-without-response

Add methods for choice of returning with or without response.