title: Rails -- uninitialized constant error for newly installed gems
body: <p>I'm having trouble using newly installed gems - I think there must be something I'm missing, because I ran across the same error with both fb_graph and koala.  I added the gem to my gemfile and then <code>bundle install</code>ed it.  I thought that was all you had to do, so I then tried using commands demonstrated in their respective wikis on github to see if they would work for me.</p>
  
  <p>In the case of Koala, I added the line <code>@graph = Koala::Facebook::GraphAPI.new</code> to my Pages controller which displays <code>pages#home</code>.  I got the error <code>uninitialized constant PagesController::Koala</code>.</p>
  
  <p>In the case of FB_Graph, I added the line <code>user = FbGraph::User.me(ACCESS_TOKEN)</code> and got the error <code>uninitialized constant PagesController::FBGraph</code>.</p>
  
  <p>Clearly I'm not doing something right - maybe there's something about configuring gems I installed that I'm missing - not really sure.  I've never really messed around with the FB API before, so it's possible the error is specifically related to FB gems.  Please advise.</p>