Dist enhancements

- I moved sample script to `examples` directory, so it would be discoverable by [MetaCPAN](http://metacpan.org) ([like here](https://metacpan.org/release/WWW-Mechanize-Cached)).
- Also, `Changes` file was reformatted to comply with [CPAN::Changes::Spec](https://metacpan.org/module/CPAN::Changes::Spec). This was done as a part of [this QH quest](http://questhub.io/realm/perl/quest/51f0337718ba7d3959000086) (It's your [only module](http://changes.cpanhq.org/author/BESSARABV) that fails the check, yay!). I changed the order of items (more recent at the top), since it's the most common format on CPAN and complies better to CPAN::Changes::Spec. Main reason - it's more pragmatic: you don't need to scroll down to see the most recent changes.