title: Gatsby.js with WordPress
body: <p>I'm using Gatsbyjs with gatsby-source-wordpress. I can pull posts from the example websites and my other WP blogs, but I can't get it to work on my development site. I have the error :</p>
  
  <blockquote>
    <p>cannot read property allWordpressPage of undefined.</p>
  </blockquote>
  
  <p>Also Gatsby doesn't pull in any posts when I run, <code>npm run develop</code>.</p>