Add function to read data stream (tabular)

[rufuspollock]

Purpose of function is to data type mapping so raw CSV becomes stream of "objects" with property values having right types.

i.e. csv

name,amount,date
jones,1.82,2015-06-22

becomes

{
  name: "jones",
  amount: 1.82
  date: Date(2015,06,22)
}

Note: same kind of streaming support should be there as in the underlying csv library.

[pwalsh]

Shouldn't we add this as a streaming interface to infer in json-table-schema, rather than in datapackage-read?

Current infer there is just a direct port from Python.

Maybe what you are asking for here is not exactly the same use case as what we designed infer around. In any event, it seems a "streaming infer" belongs to the json-table-schema package, rather that datapackage-read.

[rufuspollock]

@pwalsh i think you are probably right - probably better in jts stuff.