Remove legacy required code from AttrDef_URI, also explicitly disallow < and > in URIs.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@253 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/AttrDef/URITest.php

@@ -153,6 +153,10 @@ class HTMLPurifier_AttrDef_URITest extends HTMLPurifier_AttrDefHarness
         $uri[18] = '/a/b';
         $components[18] = array(null, null, null, '/a/b', null);
         
+        // it's not allowed, so generic URI should get it
+        $uri[19] = '<';
+        $expect_uri[19] = false;
+        
         foreach ($uri as $i => $value) {
             
             // setUpAssertDef