Merge branch '2018-improvement' of...

Merge branch '2018-improvement' of https://gitlab.univ-nantes.fr/pigeau-a/2015-Hubble-UserProfiles.git into 2018-improvement
7 jobs for 2018-improvement in 58 seconds (queued for 1 second)
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Building Heroku-based application using gliderlabs/herokuish docker image...
-----> Unable to select a buildpack
ERROR: Job failed: exit code 1