fix(bower): standardized version tagging (#4921)

Author: alimd

bower.json

@@ -20,11 +20,11 @@
     "url": "https://github.com/Polymer/polymer.git"
   },
   "dependencies": {
-    "shadycss": "webcomponents/shadycss#^v1.0.0",
-    "webcomponentsjs": "webcomponents/webcomponentsjs#^v1.0.2"
+    "shadycss": "webcomponents/shadycss#^1.0.0",
+    "webcomponentsjs": "webcomponents/webcomponentsjs#^1.0.2"
   },
   "devDependencies": {
-    "web-component-tester": "^v6.0.0",
+    "web-component-tester": "^6.0.0",
     "test-fixture": "PolymerElements/test-fixture#3.0.0-rc.1"
   },
   "private": true,