Temporal.jl support

[femtotrader]

Similar to https://github.com/femtotrader/DataReaders.jl/issues/11
and https://github.com/femtotrader/DataReaders.jl/issues/16

we should add support for https://github.com/dysonance/Temporal.jl

Related issue dysonance/Temporal.jl#3

[femtotrader]

Support could be add via NamedTuple iterator and IterableTables

see femtotrader/DukascopyTicksReader.jl#8

[femtotrader]

Related issue: dysonance/Temporal.jl#21

A possible API usage

julia> dr = DataReader("google");
julia> symb = DataSymbol("MSFT");
julia> dt_start = DateTime("2015-04-01");
julia> dt_end = DateTime("2015-04-15");
julia> response = get(dr, symb, dt_start, dt_end);
julia> df = TS(response);