set browserNotificationTimeout  to 5s
add browserNotificationTimeout variable to config
update z-index von cm-choose-source .wrapper
fix cam-1481
update cm-footer handling in desktop modus
- cm-footer now absolute positioned at bottom of cm-column
- cm-column is still fixed but goes to the bottom, it doesn't matter if a footer exists or nor, because if there is a footer, the z-index is higher
update cm-footer handling in desktop modus
- cm-footer now absolute positioned at bottom of cm-column
- cm-column is still fixed but goes to the bottom, it doesn't matter if a footer exists or nor, because if there is a footer, the z-index is higher
Merge branch 'release-0.4.4' into dev

Conflicts:
	core/comps/conversations/srvc-message-model.js