Adding reference example to chown
Adding date cheat
Merge branch 'chown-chgrp' of https://github.com/gbremer/cheat into gbremer-chown-chgrp

* 'chown-chgrp' of https://github.com/gbremer/cheat:
  Adding reference example to chown
Trivial whitespace fix on chown cheatsheet.
Merge branch 'date-cheat' of https://github.com/gbremer/cheat into gbremer-date-cheat

* 'date-cheat' of https://github.com/gbremer/cheat:
  Adding date cheat
Trivial whitespace fix on cheatsheets/date