Added an email index enforcing email uniqueness
Added an email index enforcing email uniqueness

austintimeexchange/oscurrency,insoshi/insoshi,npy179/insoshi,insoshi/insoshi,lazzarello/bk-tb-remote,npy179/insoshi,remco/insoshi,rubytalk/insoshi,karant/Barkhood,npy179/insoshi,insoshi/insoshi,karant/Barkhood,owl975/insoshi,RobDoan/weeshoop,bharathi/insoshi,roturkiye/insoshi,RobDoan/weeshoop,karant/Barkhood,roturkiye/insoshi,rubytalk/insoshi,insoshi/insoshi,owl975/insoshi,cgorringe/oscurrency,bharathi/insoshi,npy179/insoshi,cgorringe/oscurrency,cgorringe/oscurrency,owl975/insoshi,owl975/insoshi,lazzarello/bk-tb-remote,remco/insoshi,austintimeexchange/oscurrency,jsollano/insoshi,jsollano/insoshi,rubytalk/insoshi,RobDoan/weeshoop