use the 'icons' key for all examples

beastify/button/LICENSE

@@ -1 +0,0 @@
-The icon "beasts.png" is taken from the IconBeast Lite iconset, and used under the terms of its license (http://www.iconbeast.com/faq/), with a link back to the website: http://www.iconbeast.com/free/.

beastify/icons/LICENSE

@@ -0,0 +1,4 @@
+
+The icon "beasts-32.png" is taken from the IconBeast Lite iconset, and used under the terms of its license (http://www.iconbeast.com/faq/), with a link back to the website: http://www.iconbeast.com/free/.
+
+The icon "beasts-64.png" is taken from Aha-Soft’s Free Retina iconset, and used under the terms of its license (http://www.aha-soft.com/free-icons/free-retina-icon-set/), with a link back to the website: http://www.aha-soft.com/.

beastify/manifest.json

@@ -5,6 +5,10 @@
   "name": "Beastify",
   "version": "1.0",
   "homepage_url": "https://github.com/mdn/webextensions-examples/tree/master/beastify",
+  "icons": {
+    "32": "icons/beasts-32.png",
+    "64": "icons/beasts-64.png"
+  },
 
   "applications": {
     "gecko": {
@@ -17,7 +21,7 @@
   ],  
 
   "browser_action": {
-    "default_icon": "button/beasts.png",
+    "default_icon": "icons/beasts-32.png",
     "default_title": "Beastify",
     "default_popup": "popup/choose_beast.html"
   },