Merge branch 'release/0.3.11' into devel

* release/0.3.11:
  correct rspec
  Update Gemfile.lock accordingly
  bump to version '0.3.11'
restore all rspec tests

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

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
bump to version '0.3.12'

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

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'release/0.3.12' into production

* release/0.3.12:
  Update Gemfile.lock accordingly
  bump to version '0.3.12'
  restore validate task
  restore all rspec tests