title: What is therubyracer or libv8 for in a rails application?
body: <p>I was working on a project and was having issues with therubyracer and libv8 often, so i decided to remove them. It seemed to be the only thing that used them as a dependency was less-rails which I wanted to remove anyways.</p>
  
  <p>My main question is what are they for and do I need them in the average application and if so why?</p>