renamed cvmfs-lib RPM to cvmfs-devel
FIX: no SELinux labeling if unnecessary
Merge pull request #75 from reneme/fix_selinux_check

FIX: Having trouble with SELinux on CernVM

It now checks for SELinux to be installed and to be enforced before trying to change any labeling.
Merge branch 'master' into file_chunking
FIX: g++ compiler warnings