Simplified JSON returned for each entry.

The client no longer orders entries, therefore the published_seconds field is unnecessary.

Also entries are now guaranteed to have a publish date, so it's not necessary to check for the presence of a value in that column before adding the published field.
Angularjs view does not check if each entry has a publish date before painting it.

After recent changes it can be safely assumed that all entries have a publish date.
Entries published in a previous year display their publish date with a different format, showing the year instead of the time.

This helps visually distinguish old entries. With the :short format, which doesn't display the year, entries published years ago could look recent.