title: Robolectric can't find resource or manifest file
body: <p>I've created a new TestProject and added following line to my testMethod:</p>
  
  <pre><code>Robolectric.getShadowApplication().getString(R.string.mystring);
  </code></pre>
  
  <p>My test failed with</p>
  
  <pre><code>android.content.res.Resources$NotFoundException: unknown resource 2131558482
  </code></pre>
  
  <p>The console displays the following warnings: </p>
  
  <pre><code>WARNING: No manifest file found at .\..\..\MyProject\AndroidManifest.xml.Falling back to the Android OS resources only.
  To remove this warning, annotate your test class with @Config(manifest=Config.NONE).
  WARNING: no system properties value for ro.build.date.utc
  </code></pre>
  
  <p>Is AndroidManifest.xml necessary to get string resources?
  I tried to add Manifest by <strong>org.robolectric.Config.properties</strong> and <strong>@Config</strong> but the warning still occurs and I can't get string resource. I made sure the relative path to manifest is correct. 
  I also tried changing the JUnit run configuration but this did not help. </p>