Use of `recaptcha.net` to load captcha library to support it in china.

[shuklajay117]

I'm using this component in my directive and I see it is loading re-captcha google library from google.com domain. As google is blocked in china, its not working. However there's way to overcome this problem and we can load required library from another domain i.e. www.recaptcha.net as per google developers forum.

Ref - https://developers.google.com/recaptcha/docs/faq

Please have a look at question Can I use reCAPTCHA globally? in above link.

[TheSharpieOne]

Both of these places explicitly check for the google domain, we should probably make the domain configurable and just default to the google domain (to avoid a breaking change) https://github.com/VividCortex/angular-recaptcha/blob/73d01e431d07f2fc9b84c5e62677e8ed5b41a377/src/service.js#L149 https://github.com/VividCortex/angular-recaptcha/blob/73d01e431d07f2fc9b84c5e62677e8ed5b41a377/src/service.js#L162