Add app to component list (#1719)

Add app to master list of components in `package.json`

Author: hsubox76

packages/firebase/package.json

@@ -58,6 +58,7 @@
   },
   "typings": "index.d.ts",
   "components": [
+    "app",
     "auth",
     "database",
     "firestore",

packages/firebase/rollup.config.js

@@ -73,6 +73,8 @@ const appBuilds = [
 ];
 
 const componentBuilds = pkg.components
+  // The "app" component is treated differently because it doesn't depend on itself.
+  .filter(component => component !== 'app')
   .map(component => {
     const pkg = require(`./${component}/package.json`);
     return [