Added some additional entities

Changed Int32 to Long on some entities to get rid of  "Value was either too large or too small for an Int32." error.

Added Venue and Timezone to Event entity.

Added Barcode to Event Attendee for checkin status.
Added boolean flag to Context for conditional hydration of barcodes as per the api. 'show_full_barcodes'
http://developer.eventbrite.com/doc/events/event_list_attendees/

Added builders for each entity type.

Sorry for the number, I kinda let them all build up.