ViewChanges working. Added Authentication storage into a THREAD_LOCAL. Bug on logging out though.
See PlastRegSystemUI.java for the comment explaning it.

/** BUG:
			 * 	If you log out of the system, then type in the URL for a protected page again, the page will display. If you create a
			 *  new tab (or a new browser session), page protection works properly. A user who was never authenticated still cannot view
			 *  a protected page, however. For some reason, if I clear the THREAD_LOCAL Authentication object in the Logout Handler, the
			 *  ViewChangeSecurityChecker doesn't work.
			 */