Moved the styling for compare.blade.php to its own .css file at /public/css/default.css

Basically that is all. Currently, the lookup form works, it's just really slow. I think that the image fetching is the slowest part. The form will break if there is invalid input, so I think that is next on the list of things to do.
Changed the architecture of the BlizzardAPI classes. Moved some classes from the /controllers subdirectory to the /classes subdirectory.

The BlizzardAPI class is set up now so that controller methods accepts a request. So far, only characters have been implemented. For example, to get a character profile, you would pass a BlizzardCharacterAPIRequest to retrieveCharacterRequest(). The request would then be populated with the desired information, and then the information would be more accessible to the CharacterModel class.

Also created BasicEnum.class.php, an abstract class which is meant to be extended by other enumeration classes, because PHP has no native support for enums.