Use property interface

[tkf]

fixes #49

A part I didn't touch is:

Parameters.jl/src/Parameters.jl

Lines 229 to 233 in 870131f

	ns = fieldnames(T)
	args = []
	for (i,n) in enumerate(ns)
	push!(args, pop!(di, n, getfield(pp, n)))
	end

in reconstruct. I think it's better as-is. What do you think?

[mauro3]

Thanks! Yes, reconstruct should be left as is.

Do you have any idea on how properties should interact with the @unpack_MyType macros? If at all.

[tkf]

I guess "don't"? It seems properties are too dynamic to interact with static construct like @unpack_MyType. But to be honest I don't use @unpack_MyType myself so I don't have a good intuition when it'd be useful.

[mauro3]

Yes, same here. I thought I'd check.