Added custom thumbnail to the example

examples/example_kitchensink.json

@@ -62,6 +62,7 @@
                 {
                     "media":"http://maps.google.com/maps?q=Northwestern+University,+Sheridan+Road,+Evanston,+IL&hl=en&ll=42.056972,-87.676907&spn=0.02957,0.047507&sll=42.054932,-87.674654&sspn=0.014785,0.023754&oq=northwestern+&t=v&hq=Northwestern+University,+Sheridan+Road,+Evanston,+IL&z=15",
                     "credit":"",
+					"thumbnail":"http://farm7.staticflickr.com/6204/6114531655_71030ae15f_s.jpg",
                     "caption":""
                 }
             },