Relocated all Foundataion chapter content under respective folder

Tagging and slide-deck building remains the same. This improves
human-readable strcuture of slides/chapters available.
Moving Command History into a code block
2013-04-10 Online Advanced Class Notes
2013-04-10 Advanced Class Notes CLI Cleanup
Completed content folderization for human-readable organization

This does not affect the tagging of the posts themselves. Only the
folder structure of the content in _posts
Merge commit '8eee22a' into gh-pages