Email broadcast utility for MailChimp. Works with RSVPMaker.
Added action hook for 'rsvpmaker_email_list_ok' - works with RSVPMaker to automatically add someone to the email list if they check the optional 'email_list_ok' (add me to your email list) checkbox on the RSVP form.
Corrected instructions for cron setup (file path)
Update to Settings screen. Eliminated the requirement to specify the file path to MailChimp API class file.
Renamed MailChimp API class to avoid conflicts with other plugins, such as the MailChimp signup form plugin.