rename file directory(public->files), according to new docpad convention
Add mac-java-web-start
fix mac-java-web-start
Add git-password-caching
update date functions for updated docpad
Add 'progit-ko-book-published' article
update 'progit' article
Merge branch 'draft/progit-ko-book-published' into ready
update: replace 'github.com' to 'github.io'
Fix showing document's date instead of relatedDocuments's date
Add w(riting) environment for debug and writing.

In w environment, docpad ignore files that has '2008~2012' filename.
see details in docpad.coffee.
Fix @layout plugin.