title: Unknown ruby interpreter string component: 'ruby_1.9.3' when switching directories
body: <p>When I cd into my project directory I get the following error:
  Unknown ruby interpreter string component: 'ruby_1.9.3'.
  The error doesn't seem to cause any problems as everything works as expected but I'm wondering what would cause the terminal to display the error when switching into a directory.</p>
  
  <p>Environment: Mac OSX Mountain Lion, Ruby 1.9.3, JRuby, RubyMine</p>