* Fix to_s on directory resource
The `to_s` method on the `directory` resource is not defined
in the correct class, leading `directory` resources to be printed
as the parent resource (`file`) instead.
Signed-off-by: Adam Leff <adam@leff.co>
* Directory existence should check to see if it's a directory
Signed-off-by: Adam Leff <adam@leff.co>