[1.6.1] Implement BoolToCSS attribute transformations for td,th.nowrap and hr.noshade

- Implement CSS property white-space:nowrap;
- Update TODO with more ambitious goal: all transforms by 1.6.1

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1012 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/Strategy/ValidateAttributesTest.php

@@ -220,6 +220,16 @@ class HTMLPurifier_Strategy_ValidateAttributesTest extends
             '<hr size="3" />',
             '<hr style="height:3px;" />'
         );
+        $this->assertResult(
+            '<hr noshade />',
+            '<hr style="border-style:solid;" />'
+        );
+        
+        // td boolean transformation
+        $this->assertResult(
+            '<td nowrap />',
+            '<td style="white-space:nowrap;" />'
+        );
         
     }