Updating XSS cleaning to better handle base64 encoded attributes.
Updating XSS cleaning to better handle base64 encoded attributes.

Conflicts:
	system/core/Security.php

luisvillasenor/iEureka,nyfagel/klubb,jreinert/filebin,Bluewind/filebin,Bluewind/filebin,zares85/mvf,luisvillasenor/iEureka,jreinert/filebin,Bluewind/filebin,luisvillasenor/iEureka,nyfagel/klubb,Bluewind/filebin,Bluewind/filebin,jreinert/filebin,zares85/mvf,jreinert/filebin,nyfagel/klubb,jreinert/filebin,jreinert/filebin