- Added sample detail view with redirection if id is missing
- Comment on my changes in the DB classes:
	- Inbuild classes need to be included with a preceding \ if 
	  namespacing is used (\PDO, \PDOException etc.)
	- Article.php seems to have an invisible character on line 1 or 2,
	  causing a fatal error concerning namespace declaration.
	  Article2 is a temporary substitute.