check for existence of waiting web notifications
start injecting notification into DOM
inject CSS with notification
center and overlay notification
use double-div to get notification modal with darkened page behind it
dismiss notification button
add notification link and cancel button
custom cta in notification
add notification title
add notification image
ensure that notification modal background covers everything
make test runner IE-safe
IE test fix for identify with notification check
simple timeout to avoid trying to show notifications before body exists
WIP mark notification as shown
start notification styling
support for multi-par notification body
more notification styling
support light+dark notifications
preserve mixpanel context within notification callbacks