Util for maintaining files with smack accesses

Hello,
My name is Jan Cybulski and I am employee of Samsung Electronics Co.
I would like to ask for pulling these three commits.

My aim was to provide a tool for maintaining smack accesses rules, yet without enforcing everyone to use these changes or changing any existing API.
Commits implement simple sorting for a smack accesses lists, basic operations on sets of sorted rules and command line tool that provides these functionalities.

Best regards
Jan Cybulski