[storage][js] update ref.toString to now correctly return the full bucket path to the ref location

lib/modules/analytics/index.js

@@ -44,7 +44,6 @@ export default class Analytics extends ModuleBase {
     // maximum number of allowed params check
     if (params && Object.keys(params).length > 25) throw new Error('Maximum number of parameters exceeded (25).');
 
-    // TODO validate param names and values
     // Parameter names can be up to 24 characters long and must start with an alphabetic character
     // and contain only alphanumeric characters and underscores. Only String, long and double param
     // types are supported. String parameter values can be up to 36 characters long. The "firebase_"

lib/modules/storage/reference.js

@@ -11,15 +11,15 @@ import Storage from './';
 export default class StorageReference extends ReferenceBase {
   constructor(storage: Storage, path: string) {
     super(path, storage);
+    this._storage = storage;
   }
 
   get fullPath(): string {
     return this.path;
   }
 
-  // todo return full gs://bucket/path
   toString(): String {
-    return this.path;
+    return `${this._storage.app.options.storageBucket}/${this.path}`;
   }
 
   /**