Updating CHANGELOG with 0.6.6 dw8 and 0.5.9 dw7 release
Updating CHANGELOG with 0.6.6 dw8 and 0.5.9 dw7 release

skinzer/tenacity,mauricionr/tenacity,yammer/tenacity,Trundle/tenacity,yonglehou/tenacity,jplock/tenacity