Add boolean properties for enum type
Add boolean properties for enum type

This is so we can do participant.IS_OPEN_GROUP, etc.

studio666/gratipay.com,studio666/gratipay.com,mccolgst/www.gittip.com,eXcomm/gratipay.com,eXcomm/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,studio666/gratipay.com,gratipay/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com,eXcomm/gratipay.com,eXcomm/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com