Cleanup package.json
Cleanup package.json

 - Move @types to dev d ependencies.
  - Remove unused dependencies on babel
  - Remove extraneous reference to flow task

rgbkrk/nteract,nteract/composition,nteract/nteract,rgbkrk/nteract,nteract/nteract,nteract/composition,nteract/composition,nteract/nteract,rgbkrk/nteract,nteract/nteract,nteract/nteract,rgbkrk/nteract,rgbkrk/nteract