rework gem rake tasks

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
rework gem rake tasks

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
tests release task

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