Add endpoint for post revisions; allow post revisions in JSON even though they aren't publically queryable [See #164]
Add view-revsion context to prepare_post(); exclude version-history and replies links from view-revision context; remove json response and just return struct.
Merge branch 'master' into feature/revisions
Register revisions endpoint for CPTs
Merge pull request #193 from WP-API/revision-endpoint

Add endpoint for post revisions (v2)