Log Message:
Update to 2015.12

Upstream changes:
2015.12  Sun Nov 29 2015
# No new features.

2015.011_09  Mon Nov 09 2015
! LineBreak.xs
  - uvnui_to_utf8() was obsoleted by Perl 5.20.0. Use uvchr_to_utf8().

2015.011_03  Sun Nov 03 2015
! LineBreak.xs
  - Bug fix: CPAN RT #106714: Unicode::GCString fails to handle numeric value,
    mostly on *BSD and Mac OS X.
! t/10gcstring.t
  - Adding more case.

2015.11  Sun Nov 01 2015
# No new features.
! lib/Unicode/LineBreak.pm
  - CPAN RT #106859: The latest version is not indexed.
! t/10gcstring.t
  - testing that GCString stringify numeric arguments (CPAN RT #106714).

2015.07.16  Fri Jul 17 2015
# No new features.
! LineBreak.xs
  - utf8_to_uvuni_buf has been deprecated by Perl 5.19.4.

2015.06  Sun Jun 21 2015
# Unicode 8.0.0, bundled sombok 2.4.0.
! lib/Unicode/LineBreak.pod
! lib/POD2/JA/Unicode/LineBreak.pod
! t/18currency.y
  - add a change for U+20BE.