normalizing json 2 melted dataframe and uploading to synapse

[teslajoy]

Review and implantation history of this utility function may be found https://github.com/Sage-Bionetworks/synapseAnnotations/pull/141

Moving pull request to leave synapseAnnotations repo as a data repository.

[kdaily]

Closing this because we need to do a move between two repos to preserve history.