Add sakura-vps#01 to be under Chef's management.
Merge branch 'nodes' into dev
Modify the index.html to serve as a maintenance page.

Modify the index.html the nginx recipe deployes,
so that the index.html page serve as a maitenance page.

Before : Only shows the server information
After  : Shows the sorry message

This commit fixes #118.
Merge branch 'id/118' into dev
Merge commit 'be52a71d7f29c8c342d286d4d1c9ab3726824728' into HEAD