Change to how default acls are handled

[Jamstah]

Having just played with this code, I'd like to suggest a change to how default acls are handled. Technically, the ACL and Default ACL for a directory are two different resources, so I think something like this would be better:

acl /tmp/directory do
  user 'rwx'
  group '': 'r-x', testgroup: 'rwx'
  mask 'rwx'
end
default_acl /tmp/directory do
  user 'rwx'
  group '': 'r-x', testgroup: 'rwx'
  mask 'rwx'
end

That would also allow for having an action :remove to remove acls or default acls individually.

I might be able to do the work, and would also recommend being able to accept the current form with a deprecation warning. Didn't want to do the work and submit a PR without having a design discussion though.

[vnaipaul]

What about letting the default property be a boolean as well as a Hash, while deprecating the Hash form ?