release 0.5.1

Author: dfreedm

bower.json

@@ -2,7 +2,8 @@
   "name": "paper-progress",
   "private": true,
   "dependencies": {
-    "core-range": "Polymer/core-range#master",
-    "paper-button": "Polymer/paper-button#master"
-  }
-}
+    "core-range": "Polymer/core-range#^0.5.0",
+    "paper-button": "Polymer/paper-button#^0.5.0"
+  },
+  "version": "0.5.1"
+}