Updated Examples section, added new file, re-org

--Changed "Policy" to "Common Promise Patterns" to more effectively describe the examples. The name change resulted in a Category change for all sub-files.

--Created an "Orange Book" page which includes special topics.

--Created a "Sample Polices" file and moved info that was formerly on the Examples index page to this page. The page show users how to integrate samples that ship with the CFEngine distribution.