Update to 1.12

Upstream changes:
1.12  Wed Jul  3 16:38:00 2013
- Change text in README referring to licence to match text in body of source, since it was in conflict
with the Artistic Licence V 2.0.
This was requested by Petr Pisar who packages stuff for Red Hat.
- Rename CHANGES to Changes as per CPAN::Changes::SPEC.
- Various spelling fixes in the docs, as kindly reported by dsteinbrunner.

(wen)