title: require file on the top level directory
body: <p>Here is my project structure:</p>
  
  <pre><code>/app
  --/lib
  ----/porter.rb
  --/spec
  ----/porter_spec.rb
  </code></pre>
  
  <p>In file porter_spec.rb i have include directive:</p>
  
  <pre><code>require '../lib/porter' 
  </code></pre>
  
  <p>Now I'm trying to run the test:</p>
  
  <pre><code>cd app
  rspec
  </code></pre>
  
  <p>and get the error:</p>
  
  <pre><code>C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- ../lib/porter (LoadError)
          from C:/Ruby193/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
          from C:/Dropbox/development/myprojects/lj-parser/spec/porter_spec.rb:3:in `&lt;top (required)&gt;'
  </code></pre>
  
  <p>How can I require file on lib folder?</p>