Improve gunicorn in docker images

[laurensvdwiel]

Add improvements from :
https://pythonspeed.com/articles/gunicorn-in-docker/​

To the MetaDome project at:

• https://github.com/cmbi/metadome/blob/master/docker-compose.yml#L6
  and
• https://github.com/cmbi/metadome/blob/master/docker-compose-dev.yml#L8

[laurensvdwiel]

@laurensvdwiel will change the following:
gunicorn -b 0.0.0.0:5000 metadome.application:app

To

gunicorn -b 0.0.0.0:5000 metadome.application:app --worker-tmp-dir /dev/shm --workers=2 --threads=4 --worker-class=gthread

[laurensvdwiel]

This fix causes problems on the server: #58

Will revert these changes as a fix

[laurensvdwiel]

This enchancement has now been reverted as it caused issues (see: #58 )

This enhancement will now be closed