Php Pds Skeleton Versions Save

First stable release.

• Removed "examples" from the description of the docs/ directory.
• Removed vendor/ from the standard entirely, as research has nothing to say about it.
• Added validator and generator tools, with expanded compliance checking.
• Other clarifications.

• Per additional research, add a resources/ directory to the standard
• Per #1, note that packages SHOULD provide a license file.
• Various clarifications.

Provisional review complete; ready for public review and comment.

Primary research complete; ready for provisional review.