test(root): use import syntax

Using the export syntax, Rollup generates an empty bundle.

Author: cartant

src/test-root.ts

@@ -1,8 +1,8 @@
-export * from './angularfire2.spec';
-export * from './database/firebase_list_factory.spec';
-export * from './database/firebase_object_factory.spec';
-export * from './database/firebase_list_observable.spec';
-export * from './database/firebase_object_observable.spec';
-export * from './database/query_observable.spec';
-export * from './auth/auth.spec';
-export * from './auth/auth_backend.spec';
+import './angularfire2.spec';
+import './database/firebase_list_factory.spec';
+import './database/firebase_object_factory.spec';
+import './database/firebase_list_observable.spec';
+import './database/firebase_object_observable.spec';
+import './database/query_observable.spec';
+import './auth/auth.spec';
+import './auth/auth_backend.spec';