Merge branch 'ref_image' into 'master'

Added an optional reference image to Galbally IQM See merge request !12
5 jobs from master in 18 minutes 34 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #125962
docker
build_linux_27

08:21

79.0%
passed #125963
docker
build_linux_36

08:17

79.0%
passed #125964
macosx
build_macosx_27

18:08

79.0%
passed #125965
macosx
build_macosx_36

17:06

79.0%
 
  Deploy
passed #125966
deployer
deploy_beta

00:26