Modified the behavior of Puppet::Resource::Status as follows:

• #change_count now only counts events that represent successful changes. It does not count failures, audits, or noops.
• #changed is equivalent to #change_count > 0.
• #out_of_sync_count (a new attribute) counts all events except audits.
• #out_of_sync is equivalent to #out_of_sync_count > 0.

This should hopefully make the summary statistics in reports more useful.