Can look up countries by 3 letter ISO identifier and name and view as HTML.

Added the ability to look up countries by 3 letter ISO identifier (as well as the already supported 2 letter identifier) and also by name.

Countries can now be viewed as an HTML page, as well as fetched as JSON.

The information and examples on the home page have been updated.
Added page-not-found view.
Added simple currency conversion value for the Euro (EUR).