release 0.5.2

Author: dfreedm

bower.json

@@ -2,7 +2,8 @@
   "name": "core-icon",
   "private": true,
   "dependencies": {
-    "core-iconset": "Polymer/core-iconset#master",
-    "core-icons": "Polymer/core-icons#master"
-  }
-}
+    "core-iconset": "Polymer/core-iconset#^0.5.0",
+    "core-icons": "Polymer/core-icons#^0.5.0"
+  },
+  "version": "0.5.2"
+}