title: How to find the path a Ruby Gem is installed at (i.e. Gem.lib_path c.f. Gem.bin_path)
body: <pre><code>Gem.bin_path('cucumber', 'cucumber')
  </code></pre>
  
  <p>Will return the binary/executable's path.
  It seems there is no such function to return the library path.
  Which in this case would, ideally, return:</p>
  
  <pre><code>/home/hedge/.rvm/gems/ruby-1.9.2-p136@bbb-bdd-meta-bdd/gems/cucumber-0.10.0/lib
  </code></pre>
  
  <p>Have I missed something or is there a simple/one method way to get this information? </p>
  
  <p>Updated:  No CLI or non-stdlib suggestions please.</p>