Update Pod-Simple to CPAN version 3.28

  [DELTA]

2013-05-04   David E. Wheeler <david@justatheory.org>
  * Release 3.28

  Removed use of 'done_testing' in t/white.t, which was added in
  v3.27. Thanks to Paul Howarth for the catch.

  Fixed inproperly calculated number of skipped tests in t/xhtml01.t
  when HTML::Entities is not intalled.

2013-05-03   David E. Wheeler <david@justatheory.org>
  * Release 3.27

  Added new warnings as defined by Pod::Checker, thanks to RJBS:
  + "=over" without "=back"
  + "L<>" starts or ends with whitespace
  + raw "|" or "/" in "L<text|link>" text

  Added ->keep_encoding_directive, which is false by default, to
  prevent formatters from emitting a document's '=encoding'
  directive in most cases. That they emitted the encoding was a bug
  introduced in v3.26 (RT #84093). Now, only the DumpAsText and
  DumpAsXML formats set it to true. Patch from Patrice Dumas.
update CoreList for new Pod::Simple in 5.18.0
perldelta: combine, merge, and edit "modules updated"
perldelta: remove the "from version X" from module updates

too many were incorrect
bump patchlevel to RC2, update hist