Fixing #3139 - all properties can now be audited

This provides a full audit trail for any parameter on any
resource Puppet can manage. Just use:

file { "/my/file": audit => [content, owner] }

And Puppet will generate an event any time either of
those properties change.

This commit also deprecates the 'check' parameter in favor of
a new 'audit' parameter.

Signed-off-by: Luke Kanies <luke@puppetlabs.com>