Update from consolidated repo. Release v0.6.0

Author: robbear

bower.json

@@ -1,14 +1,14 @@
 {
   "name": "basic-stack",
   "description": "Stacks its child elements on top of each other, taking on the maximum height and width of the child elements.",
-  "version": "0.6.0-preview",
+  "version": "0.6.0",
   "license": "MIT",
   "main": "basic-stack.html",
   "dependencies": {
     "basic-aspect": "basic-web-components/basic-aspect#master",
     "basic-children-content": "basic-web-components/basic-children-content#master",
     "basic-shared": "basic-web-components/basic-shared#master",
-    "polymer": "Polymer/polymer#0.9.0-rc.1"
+    "polymer": "Polymer/polymer#0.9.0"
   },
   "devDependencies": {
     "basic-framed-content": "basic-web-components/basic-framed-content#master",