Update README
Squashed 'site-cookbooks/' content from commit 8ef28bc

git-subtree-dir: site-cookbooks
git-subtree-split: 8ef28bceaa6a9eded47e640d26df4a6f3a80320c
Merge commit 'f1a5c290aa93b6ed70888df5938c6e851a540cef' as 'site-cookbooks'
Squashed 'site-cookbooks/apt/' content from commit 8ef28bc

git-subtree-dir: site-cookbooks/apt
git-subtree-split: 8ef28bceaa6a9eded47e640d26df4a6f3a80320c
Merge commit '1d6f60449ce4d9499ea530fa158b48b06d85aa00' as 'site-cookbooks/apt'
Squashed 'site-cookbooks/ark/' content from commit c2d1969

git-subtree-dir: site-cookbooks/ark
git-subtree-split: c2d196923d1296622401784257b9f9aea3f26eb0
Merge commit 'c516dd5d38a573add8358f25b5eff1d128bb8f49' as 'site-cookbooks/ark'
Squashed 'site-cookbooks/chruby/' content from commit 3c44885

git-subtree-dir: site-cookbooks/chruby
git-subtree-split: 3c4488519b933b4f8bbf0fdb1426085fc85419cb
Merge commit '2fc7e892683d98dde189c32b971629768e686d8d' as 'site-cookbooks/chruby'
Squashed 'site-cookbooks/ruby-build/' content from commit 4d33619

git-subtree-dir: site-cookbooks/ruby-build
git-subtree-split: 4d3361995a6953076951693eff1b326ab499fe1e
Merge commit 'ae54b57f2713019c6c370d11b65d02d0e05db4e1' as 'site-cookbooks/ruby-build'