add optional crash handler to monitor, fix usyslog and monitor module
add stub auto umount crash handler
add function to list all mountpoints (linux)
fix debug log in monitor module
add unmount function (linux)
crash handler: unmount stalled mountpoint
implement platform_mountlist and platform_umount on OS X
use proper OS X error code to detect stalled mount point
cosmetics
add test case for auto unmount after crash
Merge branch 'unmount-on-crash' of github.com:cvmfs/cvmfs into unmount-on-crash