Return promise from init

lib/index.js

@@ -9,15 +9,23 @@ export * from  './components/index';
 
 
 export function init(schemaUrl) {
+  var promise = new Promise(function(resolve, reject) {
+
     SchemaManager.instance().load(schemaUrl)
     .then(() => bootstrap(Redoc))
     .then(
       () => {
         redocEvents.bootstrapped.next();
         console.log('ReDoc bootstrapped!');
+        resolve();
       },
-    error => console.log(error)
+      error => {
+        console.log(error);
+        reject();
+      }
     );
+  });
+  return promise;
 }
 
 window.Redoc = Redoc;