Release Name: 1.2.3

Notes:



Changes:
* Added: Get your buildfile created form existing POM, just run buildr on existing Maven project (Anatol Pomozov). 
* Added: package(:tar), package(:tgz), TarballTask dn TarTask (Tommy Knowlton).
* Changed: The ArchiveTask needs no introduction: it's a base task that provides common functionality for ZipTask, TarTask and friends. 
* Fixed: Release runs buildr instead of buildr.cmd on Windows (Chris Power).
* Fixed: Cobertura reports broken (Anatol Pomozov).