Further byline changes in develop

[benlk]

• change 'Last modified' to 'Updated'
• create method in the Largo byline class generic conditional function to check if a post has been updated, by diffing published and updated times
• display normal largo_time published date if not is_single() or if it hasn't been updated
• display updated date if it's been updated, even if not logged in

This extends #1126 somewhat

[aschweigert]

this is needed for rivard report

[benlk]

In bylines in single posts, are we moving the date down to the main byline, or are we only displaying the date in the main byline if it's the Updated date?

The current Largo behavior is to hide the published date with CSS:

body.normal.single-post article.post > header .sep,
body.normal.page article.post > header .sep,
body.normal.single-post article.page > header .sep,
body.normal.page article.page > header .sep,
body.normal.single-post article.post > header .entry-date,
body.normal.page article.post > header .entry-date,
body.normal.single-post article.page > header .entry-date,
body.normal.page article.page > header .entry-date {
    display: none;
}

This is the published date's html:

<time class="entry-date updated dtstamp pubdate" datetime="2016-06-02T00:26:14+00:00"><span class="published">Published </span>June 2, 2016</time>

This is the updated date's html:

<span class="last-modified">Updated June 2, 2016 at 11:29 pm</span>

[aschweigert]

The current placement of the date doesn't really work and we should get rid of it and make this the new default. We should either include the published and/or updated date inline with the byline or we should put it on a new line below the byline (depending on how much space we have and how cramped it feels).

[aschweigert]

also, that css is insane, let's definitely not do that

[benlk]

The craziness of those styles is due to #1264

• remove date-hiding styles
• remove current placement of date in the upper-right