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

This reverts commit ac4f12c692c437e676c02fcc4e49def4f546e058.
mvn gitflow:release setting POM version to 0.4-SNAPSHOT
Better exceptions.
Merge branch 'release/0.3' into develop