improve notifications, set user's name
improve notifications, display user's portrait
refactor portrait logic
sending notification with different ids
Revert "bug fix, only the name of the last user should show up in the topbar"

This reverts commit 24f4083c37e64b3655f54083eb78b846d8d2881f.
add read field to Alert to track alerts that haven't been read yet
display notifications only when activity is in background, clear notification once activity is visible
check if user is the same for all notifications, if it is, it should display his portrait as largeIcon
display "x new alerts" as title when they are not all from the same user
use InboxStyle to group alerts