title: How to check if an app is installed to my Shopify Store
body: <p>I can see all of my installed apps in shopify admin/apps, but i want to check it using some code behind (from my rails app).</p>
  
  <p>Is there any way to list all the installed apps in my Shopify Store</p>
  
  <p>or check specific app if it's installed or not?</p>
  
  <p>Thank you.</p>