Update to 1.19

Upstream changes:
1.19  2015-10-28 MANWAR
      - Added key 'provides' to the Makefile.PL script.
      - Added standard unit test script (t/00-load.t).

1.18  2015-10-26 MANWAR
      - Added MIN_PERL_VERSION to the Makefile.PL script.
      - Tidied up and documented package PDF::Create.
      - Tidied up and documented package PDF::Create::Page.
      - Tidied up README file.

1.17  2015-10-25 MANWAR
      - Renamed file CHANGES to Changes.
      - Tidied up Changes file.
      - Added standard unit test for Changes file (t/changes.t).

1.16  2015-10-24 MANWAR
      - Fixed the warning thrown by method PDF::Image::GIF::UnLZW().
      - Tidied up example scripts (eg/sample.pl and eg/sample-cgi.pl).
      - Added sample images used by example scripts.
      - Added standard unit test for MANIFEST file.

1.15  2015-10-24 MANWAR
      - Added key 'CreationDate' to the list of valid keys to constructor.
      - Tidied up pod document of PDF::Create.
      - Tidied up Makefile.PL script.
      - Removed MANIFEST from .gitignore file.

1.14  2015-10-23 MANWAR
      - Added section REPOSITORY, LICENSE to the pod document.
      - Added standard pod syntax testing script t/pod.t
      - Added MANIFEST file.

1.13  2015-10-22 MANWAR
      - Fixed the distribution as earlier v1.12 didn't have any code (MANWAR).

1.12  2015-10-22 MANWAR
      - Updated repository link in the Makefile.PL script (MANWAR).

(wen)