handle memoization of f in differential evolution.

Handle NaNs in differential evolution function evaluation.

update readme

bump neanderthal version

Small L2 regularisation penalty on B, D matrices in ident.

Formatting in optimisation output.

Identification for B, D matrices now returns optimisation success flag.

L-BFGS now falls back to gradient descent for failed steps.

Minor changes to docs; return E in identified models.

description

First version number, comments formatting.