cmd/elwin: update json response to include namespace
cmd/elwin: update json response to include namespace

json response will now include the namespace name so experiments names
can be reused and differentiated more easily. also added some helper
functions to clean up the json generation.

foolusion/choices,Nordstrom/choices,13scoobie/choices,13scoobie/choices,foolusion/choices,foolusion/choices,13scoobie/choices