title: Querying for Customers using the API
body: <p>Using the command line shopify application</p>
  
  <pre><code>include ShopifyAPI
  Customer.first(:params =&gt; {:query =&gt; "email:foo@fizz.com", :fields =&gt; "email"})
  
  =&gt; #&lt;ShopifyAPI::Customer:0x00000100b75448 @attributes={"email"=&gt;"poohbear@gmail.com"}, @prefix_options={}, @persisted=true&gt; 
  </code></pre>
  
  <p>I am curious if it is possible to have a query where you provide an email and the result is either empty set (not found) or a record of a customer? I am always getting a customer record back no matter what my query is. That makes it hard to determine if a Customer exists or not from outside the shop.</p>