add linting (and some initial fixes)

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+# pkg-dir [![Build Status](https://travis-ci.org/sindresorhus/pkg-dir.svg?branch=master)](https://travis-ci.org/sindresorhus/pkg-dir)
+
+> Find the root directory of a npm package
+
+
+## Install
+
+```
+$ npm install --save pkg-dir
+```
+
+
+## Usage
+
+```
+/
+└── Users
+    └── sindresorhus
+        └── foo
+            ├── package.json
+            └── bar
+                ├── baz
+                └── example.js
+```
+
+```js
+// example.js
+var pkgDir = require('pkg-dir');
+
+pkgDir(__dirname).then(function (rootPath) {
+	console.log(rootPath);
+	//=> '/Users/sindresorhus/foo'
+});
+```
+
+
+## API
+
+### pkgDir([cwd])
+
+Returns a promise that resolves to the package root path or `null`.
+
+### pkgDir.sync([cwd])
+
+Returns the package root path or `null`.
+
+#### cwd
+
+Type: `string`  
+Default: `process.cwd()`
+
+Directory to start from.
+
+
+## Related
+
+- [pkg-dir-cli](https://github.com/sindresorhus/pkg-dir-cli) - CLI for this module
+- [find-up](https://github.com/sindresorhus/find-up) - Find a file by walking up parent directories
+
+
+## License
+
+MIT © [Sindre Sorhus](http://sindresorhus.com)