Convert to inline resources and test create_if_missing
Inline resources greatly simplify the notification issues. This also fixes requiring a command when you delete a cron entry, which was a regression in 1.7.1. I've added a serverspec to ensure we're handling create_if_missing correctly by first creating a cron entry, then creating it again with create_if_missing. We can expect to find the content of the first creation only.
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