Update to 0.31

Upstream changes:
0.31	2013-05-31T10:21:06+0200
    - applied a patch from cjm with slight modification to resolve RT#50723
      (support use Foo::Bar (); etc) (Kenichi Ishigaki)
    - fixed RT#71761 (Kenichi Ishigaki)
    - applied a patch from wyant (RT#71761) (Kenichi Ishigaki)
    - fixed the Pod::Simple encoding issue (Kenichi Ishigaki)
    - Fix incorrect regexp (ref gh-5). (Yasutaka ATARASHI)
    - Avoid regex features introduced only in later perl (close gh-5).
      (Yasutaka ATARASHI)
    - Use plan() instead of done_testing() (ref gh-5). (Yasutaka ATARASHI)
    - Add support for bareword leading hyphyen, in-place arrayref and hashref.
      (Yasutaka ATARASHI)
    - proper version number for older releases (Brian Cassidy)


0.30	2013-04-18T08:57:49+0200
    - Add accessors and tests for _in_eval/_out_of_eval. (Yasutaka ATARASHI)
    - reworked 80_failig.t to TODO tests; (Thomas Klausner)
    - added more require-in-string corner test cases (suggested by Buddy Burden)
      (Thomas Klausner)
    - Fix the case for eval["']expr["'] and add regression tests.
      (Yasutaka ATARASHI)

0.29    2013-02-25T20:25:44+0100
    - fixed regex to filter use/require (RT83569) (reported by
      ribasushi)


0.28   2012-08-21T14:41:15+0200
    - whitespace in use base is valid (Barbie)


0.27	2012-03-23T12:40:44+0100
    - fixed 23_universal_require.t for real (RT75342) (reported by
      Manoj Kumar and Paul Howarth)


0.26    2012-03-23T08:42:25+0100
    - removed Test::NoWarning from a t/23_universal_require.t because
      it upsets the (manual) plan if the tests are skipped


0.25    2012-03-22T10:55:42+0100
    - autogenerate the grammer during ./Build (based on a patch by
      jtbraun@CPAN.org) (RT74879)
    - added $VERSION to into Module::ExtractUse::Grammar, suggested
      by Manoj Kumar (RT75342)
    - specify min verion of Parse::RecDescent (1.967009),
      suggested by ANDK@cpan.org (RT75130)
    - fix typos reported by gregor herrmann (RT75115)
    - switched to Dist::Zilla (all on my own!)


0.24    2012-02-12T14:27:36+0100
    - regenerated Grammer to work with new Parse::RecDescent
      (thanks to cpan-testers, TMUELLER, KENTNL, dirkus@yo****.com and
      paul@city****.org for reporting the problem)

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