Comments in the "Course feed" page

[hans]

Two changes to the comments in the course feed page:

1) Currently we display the title of the comment as it is in the feed.

Blogger:

<title type='text'>Tänud osalemast! Tore, et leidsid enda jaoks üht-t...</title>

Wordpress:

<title>Hans Põldoja kommentaar 9. nädal &#8211; kokkuvõte kohta</title>

Instead of that we should display WHO posted the comment to WHICH blog.

<h4 style="padding-top:15px;">Hans Põldoja to Tiia Niggulis</h4>

If we are able to detect, who posted the comment, then we should display his/her full name as it is enrolled to the course. If we are not able to detect the participant, then we should display the name as it is in the feed (<author><name>Hans</name>).

2) Second change is a small one: “read the post” link should be changed to “read more” (then it is consistent with the links in the posts column).

[gnum]

(In [155]) References #100, the second subtask is done, also created a unified standalone comment view, similar logic should be used for any piece of very similar code, unless there are one too many custom cases to handle

[gnum]

(In [156]) References #100, done some changes, all small versions of posts and comments content get tags stripped, plus some more changes to nicer code