As a user I want the HTML title and comments to follow the article

When I first view one article, e.g. http://www.christianalfoni.com/articles/2016_03_27_Creating-apps-with-observables, then bring up the list of articles by clicking the blue header, and then click on another article, e.g. http://www.christianalfoni.com/articles/2015_12_17_Exploring-Elm-part2, the HTML title still is the one belonging to the first article, and so are the comments. Showing wrong comments is the most confusing part of this behaviour.

Reproduce the navigation from the first article to the article list and then to the second article using the two URLs in the report. Trace the article view's title and comments data as the selected article changes; done means both the HTML title and displayed comments match the currently selected article.

Written by the indexing model from the issue text.