Galaxy Docker Image 17.05

• add PROXY_PREFIX variable to enable automatic configuration of Galaxy running under some prefix (@abretaud)
• enable quota by default (just the funtionality, not any specific value)
• HT-Condor is now supported in compose with semi-autoscaling and BioContainers
• using Docker build-args for GALAXY_RELEASE and GALAXY_REPO

Docker Compose version

• Galaxy Docker Compose is completely under Travis testing
• SLURM and HT-Condor setups provided via .env files
• HT-Condor can be used with BioContainers
• added pgadmin for devops
• rabbitmq as a separate container
• added an autoscaling example for HT-Condor