initial filesystem exercise
add some details about loops
use correct filename
use sudo
Merge pull request #3 from DevOpsBootcamp/jordane/add-filesystem

Jordane/add filesystem
Looks good. Tested last examples 11/14/2014.
Added basic filesystem navigation tutorial
Improved navigation documentation
Merge branch 'elijah/filesystems' of github.com:DevOpsBootcamp/Bootcamp-Exercises into elijah/filesystems