Remove unused code.
Use 0.2-SNAPSHOT of jgitflow
License section.
Use more recent plugins.
Add a bit of info to the help plugin & use @Mojo annotations.
Remove unused imports.
Tidy up:
- Use @Mojo annotations
- Use git revert to simplify code
- Provide git flow style output
- Remove unused junk
Revert "mvn gitflow:release setting POM version to 0.4"

This reverts commit 0a937bd037d1cfeb77ced231ceab2fbb4c441288.
mvn gitflow:release setting POM version to 0.4
mvn gitflow:release setting POM version to 0.5-SNAPSHOT
Flesh out license name.
Merge branch 'release/0.4' into develop
Use 0.3-SNAPSHOT of jgitflow.