PIP: url name changed for better readability
DEV: variables added to RssSiteFeed class
DEV: Feed syndication for Tags
DEV: Urls for Tag feed syndication
DEV: added context variable to show_items, cleanup

1. previously extra_info variable has some design part, that's cleaned and shifted to template
2. added new context variable what_view - used to identify whether we are on tag-search page or not
DEV: cleanup in page title display

as mentioned in the commit @246fae8d03a731cd89407078be8bcaa6fca98e27 extra_info variable
DEV: displaying tag feeds on the rightsidebar
DEV: Feed Syndication for individual entries or submissions
DEV: url for submission feeds
DEV: Including rss link for individual submission feeds
DEV: get_feed_url model method added

returns rss_feed_url for each revision