complete version:release

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
better error message

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
correct

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
update Gemfile.lock

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'release/0.2.4' into devel

* release/0.2.4:
  update Gemfile.lock
  correct