title: Shopify GraphQL partial matching on query filter
body: <p>I'm just getting started with the new Shopify GraphQL <strong>Admin API</strong>. I'm trying to retreive all products, where the <code>title</code> field contains a certain word.</p>
  
  <p>Currently I can successfully retrieve a product by including the full product title (exact match):</p>
  
  <pre><code>{
    shop {
      id
      name
    }
    products(first: 10, query:"title:'RAVEN DUSTY OLIVE/SILVER MESH'") {
      edges {
        node {
          productType
          title
        }
      }
    }
  }
  </code></pre>
  
  <p>However, I want to partially match the title to display all products with the word "Raven" anywhere in the title, but the following returns no results:</p>
  
  <pre><code>{
    shop {
      id
      name
    }
    products(first: 10, query:"title:'RAVEN'") {
      edges {
        node {
          productType
          title
        }
      }
    }
  }
  </code></pre>
  
  <p>Any ideas on how to get the partial matching working?</p>