title: Sencha App does not find class in package
body: <p>I packaged <a href="https://github.com/bmoeskau/Extensible" rel="nofollow">https://github.com/bmoeskau/Extensible</a>:</p>
  
  <pre><code>sencha generate package -type code calendar
  </code></pre>
  
  <p>Then I added the line</p>
  
  <pre><code>package.framework=ext
  </code></pre>
  
  <p>to <em>.sencha/package/sencha.cfg</em> in the package.</p>
  
  <p>And required the package in <em>app.json</em> of my app:</p>
  
  <pre><code>/**
   * The list of required packages (with optional versions; default is "latest").
   *
   * For example,
   *
   *      "requires": [
   *          "sencha-charts"
   *      ]
   */
  "requires": [
      "calendar"
  ],
  </code></pre>
  
  <p>The package compiles successfully using <code>sencha package build</code>, but when I run <code>sencha app refresh</code> or <code>sencha app build</code> to build the app requiring the package, the following error occurs:</p>
  
  <pre><code>$ sencha app refresh
  Sencha Cmd v5.1.3.61
  [INF] Processing Build Descriptor : default
  [INF] Loading app json manifest...
  [ERR] C2008: Requirement had no matching files (Extensible.calendar.CalendarPanel) -- /.../app/view/main/Main.js:20:442
  [ERR] 
  [ERR] BUILD FAILED
  [ERR] com.sencha.exceptions.ExBuild: Failed to find any files for /.../app/view/main/Main.js::ClassRequire::Extensible.calendar.CalendarPanel
  [ERR] 
  [ERR] Total time: 4 seconds
  [ERR] The following error occurred while executing this line:
  /Users/me/bin/Sencha/Cmd/5.1.3.61/plugins/ext/current/plugin.xml:403: The following error occurred while executing this line:
  /.../.sencha/app/build-impl.xml:378: The following error occurred while executing this line:
  /.../.sencha/app/init-impl.xml:303: com.sencha.exceptions.ExBuild: Failed to find any files for /.../app/view/main/Main.js::ClassRequire::Extensible.calendar.CalendarPanel
  </code></pre>
  
  <p>If I take the calendar example from the <em>examples</em> folder of Ext JS 5, and package it the same way, it works.</p>
  
  <p><strong>Maybe it has something to do with the <code>Extensible</code> namespace? Am I missing something crucial?</strong></p>