[1.3.0] More control of URIs granted

# Invalid images are now removed, rather than replaced with a dud <img src="" alt="Invalid image" />. Previous behavior can be restored with new directive %Core.RemoveInvalidImg set to false.
! New directives %URI.DisableExternalResources and %URI.DisableResources
! New directive %Attr.DisableURI, which eliminates all hyperlinking
- Missing "Available since" documentation added

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@575 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/Strategy/ValidateAttributesTest.php

@@ -125,6 +125,9 @@ class HTMLPurifier_Strategy_ValidateAttributesTest extends
         );
         
         // test required attributes for img
+        
+        // (this should never happen, as RemoveForeignElements
+        //  should have removed the offending image tag)
         $this->assertResult(
             '<img />',
             '<img src="" alt="Invalid image" />'