Revert "mvn gitflow:release setting POM version to 0.3"

This reverts commit ac4f12c692c437e676c02fcc4e49def4f546e058.
mvn gitflow:release setting POM version to 0.4-SNAPSHOT
Merge branch 'release/0.3' into develop
License & copyright info.
SCM & description in pom.
Tidy up.
Validation.
Use constant.
More testage.
Add link.
Correct email.
mvn gitflow:release setting POM version to 0.4
Merge branch 'release/0.4'