BLD: Add jsonschema to travis deps.
BLD: Add jsonschema to travis deps.

danielballan/dataportal,danielballan/datamuxer,NSLS-II/dataportal,ericdill/datamuxer,ericdill/databroker,danielballan/dataportal,ericdill/datamuxer,tacaswell/dataportal,NSLS-II/dataportal,NSLS-II/datamuxer,ericdill/databroker,tacaswell/dataportal,danielballan/datamuxer