Reformatted as per CPAN::Changes::Spec

* removed [ and ] from around release numbers
* consistent use of [section labels]
* consistent spacing and indenting of bullets
* merged 'not released' changes into the next CPAN release
* moved flags like *DEVELOPER RELEASE* onto the release header line
Merge pull request #18 from neilbowers/master

Reformatted Changes file as per CPAN::Changes::Spec