[Request] Facebook Native Ads

[0xohzsh]

Adding this as a request to ad support for Audience Network native ads.

@clockbyte Please take out some time to implement audience network native ads in the adapter.

[kot331107]

@technohowl We'll take a look. Bookmarking it https://developers.facebook.com/docs/audience-network/android

[hoanghiephui]

@clockbyte I think, this is a great request

[kot331107]

@hoanghiephui Absolutely. But a bit later I suppose. You guys could contribute it if you wish, will be very appreciated. And I think we can take AdmobAdapterRecyclerWrapper and underlying classes as a base stuff for Facebook ads.

UPDATE Scheduling it for the next release (probably it will be 1.5.0).