Add vim modelines to all files.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>

tests/HTMLPurifier/SimpleTest/Reporter.php

@@ -47,3 +47,4 @@ class HTMLPurifier_SimpleTest_Reporter extends HTMLReporter
 
 }
 
+// vim: et sw=4 sts=4

tests/HTMLPurifier/SimpleTest/TextReporter.php

@@ -16,3 +16,5 @@ class HTMLPurifier_SimpleTest_TextReporter extends TextReporter {
         }
     }
 }
+
+// vim: et sw=4 sts=4