Correctly check if the action == 'linkcheck'

$_GET['action'] was always being set to 'linkcheck' here.
initialize the colorbox plugin
reformat code to use spaces instead of tabs
Restructure the check methods to redue code

Allow adding loggers and filters when you call the getSpider() method so that the pageLogger (the one that displays the status of the page) will always be called after actions have been preformed by other loggers.
add the uri in the validationLogger

This way, the uri will always exist in the db when it is validated.