add attendees

[jbranc]

I'm not sure if i'm missing it or if its not supported, but I'm having trouble setting ATTENDEE properties

the main issue is that the format is ATTENDEE;value ATTENDEE;value

rather than ATTENDEE: There does not seem to be a way to add a property that isn't "name" followed by "colon" followed by "value"

any thoughts on supporting an ATTENDEE array?