title: React native: Can't import and use external packages
body: <p>I am trying to use the react-native-tabbar-navigator package. I did 
  <code>npm install react-native-tabbar-navigator --save</code> in my project directory to install the package. In my code, I have the following import lines to use the package.</p>
  
  <pre><code>import React, { Component } from 'react';
  import {TabBarNavigator} from 'react-native-tabbar-navigator'
  import MainTab from './MainTab';
  
  
  import {
    AppRegistry,
    StyleSheet,
    Text,
    View,
  } from 'react-native';
  </code></pre>
  
  <p>However, running this on my android simulator gives me the following error:</p>
  
  <p>Seems you're trying to access 'ReactNative.Component' from the react-native package. Perhaps you meant to access 'React.Component' from the 'react' package instead?</p>
  
  <p>If I remove the import line for the TabBarNavigator, the error goes away. Why is this happening?</p>
  
  <p>I am using version 0.3.0 of tabbarnavigator and 0.31.0-rc.0 version of react-native</p>