refactored ArtifactPromotionBuilder's method responsibilities to be more spesific
-Refactored to use extensions in promotion. Now it is possible to add different promotion mechanics via extensions.
using latest aether version
Merge branch 'master' of https://github.com/Timizki/artifact-promotion-plugin into Timizki-master
- bump to 0.3.0-SNAPSHOT
update license header to attribute all contributors
only some comments and a TODO task
Merge branch 'Timizki-master' - pull request #1