title: MongoMapper and bson_ext problem
body: <p>I can't get MongoMapper to work with my Rails app. I get this error message:</p>
  
  <p>**Notice: C extension not loaded. This is required for optimum MongoDB Ruby driver performance.
    You can install the extension as follows:
    gem install bson_ext</p>
  
  <p>If you continue to receive this message after installing, make sure that the
    bson_ext gem is in your load path and that the bson_ext and mongo gems are of the same version.</p>
  
  <p>I have installed DevKit and installed the gem: gem install bson_ext --no-rdoc --no-ri (result: bson_ext-1.0.1 installed)</p>
  
  <p>I'm running on Windows 7. The Rails version is 2.3.7. I used the RubyInstaller when installing. Can anyone point me in the right direction?</p>