use --all option for git add for gh-pages generation
release archives now linked from public/version

If gh-pages branch not already setup for public dir
create branch named 'public' for public dir

Makefile: make clean-archives
Cleans up version dirs used for archives

Archived resources served from:

  http://<hostname>/version/0.5.2

Archived tarball served from:

  http://<hostname>/version/0.5.2.tar.gz