post tooltips: add header bar with more post info.

Add a header bar containing the following information:

* Uploader + top tagger + upload date
* Score, favorite count, comment count
* Rating
* Source (Pixiv, Twitter, etc)
* Image dimensions

Also list series pools with tags.

app/helpers/application_helper.rb

@@ -83,9 +83,11 @@ module ApplicationHelper
     raw content_tag(:time, duration, datetime: datetime, title: title)
   end
 
-  def time_ago_in_words_tagged(time)
+  def time_ago_in_words_tagged(time, compact: false)
     if time.past?
-      raw time_tag(time_ago_in_words(time) + " ago", time)
+      text = time_ago_in_words(time) + " ago"
+      text = text.gsub(/almost|about|over/, "") if compact
+      raw time_tag(text, time)
     else
       raw time_tag("in " + distance_of_time_in_words(Time.now, time), time)
     end