More generic ouput / Return a named tuple iterator

[femtotrader]

See https://github.com/davidanthoff/IterableTables.jl

Produce elements of type NamedTuple
https://github.com/blackrock/NamedTuples.jl
http://rockthecode.io/blog/osblk-julia-namedtuples/

see https://github.com/pazzo83/NOAAData.jl/blob/master/src/NOAAData.jl

_COLS = [:Date, :Ask, :Bid, :AskVolume, :BidVolume]
_SCHEMA = [DateTime, Float64, Float64, Float64, Float64]

see https://github.com/davidanthoff/IterableTables.jl/pull/37/files

https://discourse.julialang.org/t/iterate-delimited-file-as-namedtuples/3616/6

[femtotrader]

Should help to provide Temporal output #12 via IterableTables