Updates names of classes to better match the concept of Articles.
Updated Reddit component to use derived class RedditArticle.
Updated Rss to use class Article.
Renamed xml files for uniformity and updated Rss and Reddit to use the
same layout files.
Removed unused files.
Updated MainActivity menu to remove refresh item as it shouldn't be
there.
Created new menu for Article activities.
Numerous tweaks and fixes to account for changes.