AppsFromData converts apps data from json into tasks.

GetApps retrives the app definitions from the server for a given userID.

SendMetrics sends the current state of tasks to the API.

AppDescription is the json describing an individual app.

AppsMessage is the json that arrives from /apps/<userID>.

DemandPayload is the JSON sent from the server describing the number of containers needed for each task This is only used if we're generating demand server-sde.

DockerAppConfig is the json describing parameters that need to be passed into Docker when starting this app TODO!! This is not really just Docker-specific as we have some target info in here too.