title: Wrong package.json path when npm install in react native project
body: <p>I found when I run npm install at the root of the react native project, it always show me the warn:</p>
  
  <blockquote>
    <p>npm WARN enoent ENOENT: no such file or directory, open
    '/Users/chen/Documents/react-native/project/node_modules/node_modules/package.json'</p>
  </blockquote>
  
  <p>but we know the package.json should under the node_modules folder</p>
  
  <p>and this is my <code>package.json</code> in the project root</p>
  
  <pre><code>{
    "name": "project",
    "version": "0.0.1",
    "private": true,
    "scripts": {
      "start": "node node_modules/react-native/local-cli/cli.js start",
      "test": "jest",
      "bundle-ios": "node node_modules/react-native/local-cli/cli.js bundle --entry-file index.ios.js  --platform ios --dev false --bundle-output ./ios/bundle/index.ios.jsbundle --assets-dest ./ios/bundle"
    },
    "dependencies": {
      "react": "~15.4.0-rc.4",
      "react-native": "0.40.0",
      "react-native-elements": "^0.9.0",
      "react-native-scrollable-tab-view": "^0.7.0",
      "react-native-swiper": "^1.5.4",
      "react-native-vector-icons": "^4.0.0"
    },
    "devDependencies": {
      "babel-jest": "18.0.0",
      "babel-preset-react-native": "1.9.1",
      "jest": "18.1.0",
      "react-test-renderer": "~15.4.0-rc.4"
    },
    "jest": {
      "preset": "react-native"
    }
  }
  </code></pre>
  
  <p>and everything ok with this json, after run npm install, the library will append in dependencies.</p>
  
  <p>and also has another <code>package.json</code> in node_modules foloder, and this json wont update when I run npm install, the error said it point to <code>node_modules/node_modules/package.json</code>,of course not exist this file</p>
  
  <pre><code>{
    "dependencies": {
      "react-native-scrollable-tab-view": "^0.7.0",
      "react-native-swiper": "^1.5.4",
      "react-native-vector-icons": "^4.0.0",
      "react-native-elements": "^0.9.0"
    }
  }
  </code></pre>
  
  <p>So how's npm install find that wrong path??</p>