Grunion: Fix up the CSV export of extra fields.

See: http://[private link]

Merges r104346-wpcom.
Merge commit '5c91003'
REST API: Specify edit_post when updating a post that includes a date field

Per documentation, wp_update_post will ignore date fields unless edit_date is specified.
See: http://codex.wordpress.org/Function_Reference/wp_update_post#Scheduling_posts

Merges r104352-wpcom.