bump to version '0.2.3'

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

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Merge branch 'release/0.2.3' into devel

* release/0.2.3:
  consider management of Gemfile.lock
  bump to version '0.2.3'