ENH: Expand broker interface and MDS.
ENH: Expand broker interface and MDS.

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