add test for MixinTeam.get_members()
add test for MixinTeam.get_members()

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