Add rpcexplorer to webapp hierarchy.

web/bower.json

 {
   "name": "luci",
   "version": "0.0.0",
   "homepage": "https://github.com/luci/luci-go",
   "authors": [
     "The LUCI Authors"
   ],
-  "license": "BSD",
+  "licenses": [
+    {
+      "type": "Apache-2.0",
+      "url": "http://www.apache.org/licenses/LICENSE-2.0"
+    }
+  ],
+  "license": "Apache License, Version 2.0",
   "ignore": [
     "**/.*",
     "node_modules",
     "bower_components",
     "test",
     "tests"
   ],
   "dependencies": {
-    "polymer": "Polymer/polymer#^1.2.0",
+    "app-router": "~2.6.1",
+    "bootstrap": "~3.3.6",
+    "google-signin": "^1.3.2",
+    "html5-history-anchor": "~0.4.0",
+    "iron-ajax": "PolymerElements/iron-ajax#~1.1.1",
+    "iron-elements": "PolymerElements/iron-elements#~1.0.7",
+    "jquery": "~2.2.0",
+    "neon-elements": "PolymerElements/neon-elements#~1.0.0",
     "page": "~1.6.4",
-    "iron-elements": "PolymerElements/iron-elements#~1.0.7",
-    "neon-elements": "PolymerElements/neon-elements#~1.0.0",
     "paper-elements": "PolymerElements/paper-elements#~1.0.7",
-    "platinum-elements": "PolymerElements/platinum-elements#~1.2.0"
+    "platinum-elements": "PolymerElements/platinum-elements#~1.2.0",
+    "polymer": "Polymer/polymer#^1.2.0"
+  },
+  "devDependencies": {
+    "web-component-tester": "~4.2.0"
   }
 }