title: RuntimeError: :json is not registered on Faraday::Request
body: <p>I am fairly new to ruby and I am trying to execute a spec and I receive this error:</p>
  
  <p>RuntimeError:
         :json is not registered on Faraday::Request</p>
  
  <p>I am trying to use this gem:  <a href="https://github.com/Chicago/windy" rel="noreferrer">https://github.com/Chicago/windy</a></p>
  
  <p>Mac OS X 10.7.4
  Ruby 1.9.3, using RVM</p>
  
  <p>Thanks</p>