improvements for angular branch

[sbalay]

disable debug meta in not-dev environments https://docs.angularjs.org/guide/production#disabling-debug-data

use apply-async https://docs.angularjs.org/api/ng/provider/$httpProvider#useApplyAsync

[sbalay]

@ramadis Can you test this on your project and check if it improves performance for production?

[ramadis]

@sbalay yes, I am doing it!