Big Changes on Dev

[swainn]

All:

This is an FYI for anyone that is on the dev branch of Tethys. I've just pushed some big changes to the dev branch that include:

• A new GeoServer Docker image
  
• Upgrade to 2.8.2
• Added extensions: CSS, NetCDF, ControlFlow, and JMSClustering
• Support for running multiple instances of GeoServer in a clustered mode for better performance in production
• An update to the tethys docker CLI to make it compatible with the GeoServer docker image
• CondorWorkflow Job Types
• Uses the DAGMAN concept of Condor
• Create a workflow of jobs with dependency relationships

Better documentation is forthcoming on both of these, so use at your own risk for now. I hope to have a better explanation of the GeoServer docker and clustered mode as well as an official migration path for upgrading existing GeoServer Dockers to the new Dockers (perhaps even automated). Scott will also be adding documentation for how to work with the new CondorWorkflow.