Wrote create_multiple_choice and create_free_response.

Wrote unit tests for create_multiple_choice and create_free_response.
I know I was the one that originally did this version thing in events_search, but it's odd to have a hash parameter before the version parameter in the method definition. Could you change it so we have an options hash with an :api_version optional key instead? Just look at what I do in the api_call method.