Merge pull request #6 from libero18/CentOS/master

CentOS-5のベースイメージを作成するシェルスクリプトを追加
Merge pull request #8 from libero18/CentOS/master

add CentOS5
Merge pull request #10 from libero18/CentOS/master

update
Merge pull request #12 from libero18/CentOS/master

update
Merge pull request #14 from libero18/CentOS/master

test-kitchen用のイメージを追加
Merge pull request #16 from libero18/CentOS/master

update CentOS/5/test-kitchen
update CentOS6 images
Revert "update CentOS6 images"

This reverts commit 7e33f61f9ad70a92c6442a5e947300f41baf8c82.
update
Merge pull request #17 from libero18/CentOS/6

update CentOS/6 & add CentOS/6/test-kitchen