WP-API JSON Feed

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Adds JSON feeds following the official version 1 spec. Places a link tag to the posts feed inside the HTML head tag. Adds a new namespace feed/v1 to the REST API. Allows adding individual endpoints per post type, simply by specifying an additional argument when registering the post type. By default a feed is only added for regular posts (posts of the post post type). Uses a proper REST API controller including schema for the endpoints. Contains several filters to modify the feed responses as necessary.