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Updates default module paths/directories for next release.
PE-only modules updates

Add information on errors a user might see if attempting to download a PE-only module. Add PE users redirect note to top of the page.
Clean up Puppet 3.7 version of module docs

Remove mention of Supported Modules requirements field (that field has been removed). Updated workaround for 3.6 PMT issues to sshorter version.
Updates from team editing session.
Merge pull request #393 from laurenrother/master

Do Not Merge