title: `react-native log-android` does not show console.log() invocations
body: <p>How can I view arbitrary javascript logs with the react-native toolchain? Facebook's documentation <a href="https://facebook.github.io/react-native/docs/debugging.html#accessing-console-logs" rel="nofollow noreferrer">states <code>react-native log-android</code> should show them</a>, but I am not seeing anything when I write a trivial log such as in <code>index.android.js</code>:</p>
  
  <pre><code>import React, { Component } from 'react'
  
  // ...
  
  console.log("foo") // first log after imports
  </code></pre>
  
  <p>Would this show up in the <code>adb logcat</code> logs? This is through an emulated device, and oddly enough I can witness other trivial changes (such as, manipulations in font size), so I know my build system "works", but I can't see the logs for some reason.</p>
  
  <p>Also, note that this is using an Ubuntu GNU/Linux development system, not OSX.</p>