title: RavenDB external config is being ignored
body: <p>RavenDB's server (builds 2330 and 2380) seem to ignore the --config parameter:</p>
  
  <pre><code>Raven.Server.exe --config=another.config
  </code></pre>
  
  <p>The feature has been <a href="https://groups.google.com/forum/#!topic/ravendb/C85XplgekUc" rel="nofollow">suggested and confirmed</a> and <a href="https://github.com/ayende/ravendb/blob/2.0/Raven.Server/Program.cs#L131" rel="nofollow">implemented</a>. Are there any constraints on the location of the configuration file?</p>
  
  <p>In particular, I cannot seem to even change the port number unless I overwrite the existing configuration file Raven.Server.exe.config, rather than specifying a new configuration file using the command-line option.</p>