Initial commit
Add main file
Add __init__.py file for import
test
替换原有的文件, 增加了dbping接口
代码编写格式优化
Update class struct
优化代码格式，以及去除方法名的db_前缀
Add 'tornado/' from commit 'b152dd2d9aee428ecfcb4cd3b534fa22a2a44ab1'

git-subtree-dir: tornado
git-subtree-mainline: ec4f0201ff556bd09eb8288e9336737d8079ce33
git-subtree-split: b152dd2d9aee428ecfcb4cd3b534fa22a2a44ab1