title: Directory layout for pure Ruby project
body: <p>I'm starting to learn ruby. I'm also a day-to-day C++ dev.
  For C++ projects I usually go with following dir structure</p>
  
  <pre><code>/
   -/bin &lt;- built binaries
   -/build &lt;- build time temporary object (eg. .obj, cmake intermediates)
   -/doc &lt;- manuals and/or Doxygen docs
   -/src
   --/module-1
   --/module-2
   -- non module specific sources, like main.cpp
   - IDE project files (.sln), etc.
  </code></pre>
  
  <p>What dir layout for Ruby (non-Rails, non-Merb) would you suggest to keep it clean, simple and maintainable?</p>