Not able to install it on Windows

When I tried to `npm install javasciprt-precommit`, it gave me an error:

```

> javascript-precommit@0.0.8 postinstall C:\gitlib\javascript-precommit
> ./bin/postinstall.js

'.' 不是内部或外部命令，也不是可运行的程序
或批处理文件。

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\\Program Files\\nodejs\\\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install"
npm ERR! node v0.12.0
npm ERR! npm v2.5.1
npm ERR! code ELIFECYCLE
npm ERR! javascript-precommit@0.0.8 postinstall: `./bin/postinstall.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the javascript-precommit@0.0.8 postinstall script './bin/postinstall.js'.
npm ERR! This is most likely a problem with the javascript-precommit package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ./bin/postinstall.js
npm ERR! You can get their info via:
npm ERR! npm owner ls javascript-precommit
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! C:\gitlib\javascript-precommit\npm-debug.log
```

The chinese character in the error log above means '.' is not a valid command.

I could fix this by modify the package.json from

```
"scripts": {
"postinstall": "./bin/postinstall.js",
"uninstall": "./bin/uninstall.js"
},
```

to

```
"scripts": {
"postinstall": "node ./bin/postinstall.js",
"uninstall": "node ./bin/uninstall.js"
},
```

Could you please help fix this? Thanks for your great work :smile:

首先检查 package.json 以及其中引用的 bin/postinstall.js 和 bin/uninstall.js 脚本。验证 npm install 和 npm uninstall 是否能在 Windows 上成功调用这些脚本，并确认现有的 precommit hook 行为保持不变。

由索引模型根据 Issue 内容生成。