Added working example implementation of AddEmail. You can use /set-mappi...

Added working example implementation of AddEmail (this appends a new email to an existing reflector list, which is, of course, part of an existing mappings object). You can use /set-mappings.json to create a mappings object, and then use /add-email to append a new email address to the reflector list of that mappings object, which will trigger the calendarListUpdate function to be called, which, subsequently, pushes the update to Google. The update will be successful as long as the event title and calendarId are specified correctly and correspond to an actual Google Calendar Event.