feat(popover): background dismiss, escape dismiss
feat(popover): background dismiss, escape dismiss

background dismiss, escape dismiss

closes #6817

driftyco/ionic,manucorporat/ionic,cambronjay/ionic,cambronjay/ionic,AbraaoAlves/ionic,manucorporat/ionic,manucorporat/ionic,jhlee8804/ionic,alan-agius4/ionic,alan-agius4/ionic,alan-agius4/ionic,janglednerves/ionic,brianespinosa/ionic2-sass,dennybiasiolli/ionic,janglednerves/ionic,driftyco/ionic,janglednerves/ionic,joshesp/ionic,jarrodkoch/ionic,alan-agius4/ionic,janglednerves/ionic,AbraaoAlves/ionic,alan-agius4/ionic,joshesp/ionic,joshesp/ionic,dennybiasiolli/ionic,driftyco/ionic,driftyco/ionic,jarrodkoch/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,jarrodkoch/ionic,TillaTheHun0/ionic,janglednerves/ionic,manucorporat/ionic,cambronjay/ionic,jhlee8804/ionic,manucorporat/ionic,cambronjay/ionic,jhlee8804/ionic,joshesp/ionic,jhlee8804/ionic,AbraaoAlves/ionic,jhlee8804/ionic,cambronjay/ionic,dennybiasiolli/ionic,dennybiasiolli/ionic,TillaTheHun0/ionic,jarrodkoch/ionic,jarrodkoch/ionic,dennybiasiolli/ionic,driftyco/ionic,TillaTheHun0/ionic,AbraaoAlves/ionic,alan-agius4/ionic