integrate_transfer
==================

A transfer function that on each time step, increments the state by the product
of the input and the duration of the time step. 

	state(t+dt) = state(t) + input(t)*dt

Recall that `dt` is not constant in all models; a layer with fire_out facet,
for instance, has this effect on the model.

nodes
=====

	some_layer nodes

List the dimensions of the representation.