Die when the X11 connection breaks during runtime (Thanks Eduan)
implemented logging the number of failed attempts

This closes #1243
Fix forking with fuzzy flag
Merge remote-tracking branch 'origin'

Conflicts:
	i3lock.c
	unlock_indicator.c

In upstream i3lock, -f is used to show failed login attempts.
In i3lock-blur we already are using -f for fuzzy option, so
to make i3lock-blur show failed login attempts we use a different
switch -l.