title: Bundler is not "bundling" sqlite3
body: <p>I have a very recurrent problem here. (it happens literally all the time). I have found ways to go around it but i really would appreciate a solution for this problem:</p>
  
  <p>Here is how it goes:</p>
  
  <p>At my development machine, i have in my gem file a line like this:</p>
  
  <pre>gem "sqlite3-ruby", :require => "sqlite3"</pre>
  
  <p>what happens is that, when i bundle install --no-deployment, it goes alright:</p>
  
  <pre>Using sqlite3 (1.3.5)
  Using sqlite3-ruby (1.3.3)
  Updating .gem files in vendor/cache
  Your bundle is complete! It was installed into ./vendor/bundle</pre>
  
  <p>But then, in the deployment, running bundle install --deployment, i get:</p>
  
  <pre>Using sqlite3-ruby (1.3.3)
  Updating .gem files in vendor/cache
  Your bundle is complete! It was installed into ./vendor/bundle</pre>
  
  <p>... which causes require errors that makes the application crash.. Then, what i do is bundle install --no-deployment at the deployment machine. Then i run again bundle install --deployment and then, magically:</p>
  
  <pre>Using sqlite3 (1.3.5)
  Using sqlite3-ruby (1.3.3)
  Updating .gem files in vendor/cache</pre>
  
  <p>And then the application runs fine.</p>
  
  <p>So, what i most basically want is that bundler recognizes the sqlite3 dependency on sqlite3 gem</p>