title: Antlr4cs does nothing
body: <p>I'm new to Antlr. I want to use Antlr in C# and I've done all things described in <a href="https://github.com/sharwell/antlr4cs" rel="nofollow">https://github.com/sharwell/antlr4cs</a> but when I build my Project nothing happens.</p>
  
  <p>Part of my Project File:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;ItemGroup&gt;
    &lt;Antlr4 Include="Model\ScriptGrammar\ScriptGrammar.g4"&gt;
      &lt;Generator&gt;MSBuild:Compile&lt;/Generator&gt;
      &lt;CustomToolNamespace&gt;Model.ScriptGrammar&lt;/CustomToolNamespace&gt;
    &lt;/Antlr4&gt;
  &lt;/ItemGroup&gt;
  &lt;Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /&gt;
  &lt;PropertyGroup&gt;
    &lt;!-- Folder containing Antlr4BuildTasks.dll --&gt;
    &lt;Antlr4BuildTaskPath&gt;..\..\External\Antlr&lt;/Antlr4BuildTaskPath&gt;
    &lt;!-- Path to the ANTLR Tool itself. --&gt;
    &lt;Antlr4ToolPath&gt;..\..\External\Antlr\antlr4-csharp-4.0.1-SNAPSHOT-complete.jar&lt;/Antlr4ToolPath&gt;
  &lt;/PropertyGroup&gt;
  &lt;Import Project="..\..\External\Antlr\Antlr4.targets" /&gt;
  &lt;PropertyGroup&gt;
    &lt;PostBuildEvent&gt;$(ProjectDir)\copyExternals.bat&lt;/PostBuildEvent&gt;
  &lt;/PropertyGroup&gt;
  </code></pre>
  
  <p>My test grammar file:
  </p>
  
  <pre><code>grammar ScriptGrammar;
  options 
  { 
      language=CSharp_v4_5; 
  } 
  
  r : 'hello' ID ; // match keyword hello followed by an identifier
  ID : [a-z]+ ; // match lower-case identifiers
  WS : [ \t\r\n]+ -&gt; skip ; // skip spaces, tabs, newlines, \r (Windows)
  </code></pre>
  
  <p>I'm using Visual Studio 2012 Professional</p>