Pretty URLs

This adds mod_rewrite rules to Loris so that everything doesn't look one big ugly main.php file to the user. With this change, modules can be accessed at /ModuleName/, instead of $LorisRoot/main.php?Test_name=$ModuleName. Similarly, module specific javascript can now be accessed at $ModuleName/js/, and CSS as $ModuleName/css/.

In addition, candidates can be accessed at the URL $LorisRoot/$CandID/.