Merge pull request #10 from danbri/master

Syncing from Dan's repository
Added RsvpResponseType class, FailedActionStatus, and rsvpResponse, additionalNumberofGuests, and error properties.
Fixed the enumerations for RsvpResponseType.
Merge pull request #18 from vholland/master

Added RsvpResponseType, FailedActionStatus, and rsvpResponse, additionalNumberOfGuests, and error properties.