feat(overlay): close w/ esc key
feat(overlay): close w/ esc key

Closes #566

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