Remove remaining uses of request superglobals

I went through the application and removed any remaining uses of request superglobals ($_GET, $_POST, $_REQUEST) and replaced them with the relevant Symfony Request API call. The only uses of request superglobals that remain that I could find are those in utility classes not specific to Bolt.


Signed-off-by: Max Fierke <max@maxfierke.com>
Merge pull request #109 from maxfierke/master

Remove remaining uses of request superglobals. Fixes #72.