Updating www/p5-CSS-Tiny from 1.15nb1 to 1.17

pkgsrc changes:
- add license definition

Upstream changes:
1.17 Sun  4 Jul 2010
- Removed the use of Module::Install
- Allow read-string to be rerun again on an existing object,
  and thus also thus on tied objects (MPETERS)
- Moved POD after __END__ to reduce number of disk reads when parsing.
- Added support for running xt tests

1.16 Fri  4 Jul 2008
- Upgrading to Module::Install 0.76
- Localising $@ during evals

(sno)