Directive fixes

Improved sdPagination, sdDebounce and sdThrottle.
Give some styling to notifications

Put notifications in separate box on the top of the screen. Cover the
case of several notifications displayed at a same time
Merge remote-tracking branch 'ozan/directive-fixes'
Merge remote-tracking branch 'nikola/master'

Conflicts:
	app/scripts/superdesk/profile/views/main.html
Show user picture in users list.

SDUX-39