[MRG] GSoC 2014: Standard Extreme Learning Machines

Finished implementing the standard extreme learning machines (ELMs). I am getting the following results with 550 hidden neurons against the digits datasets,

Training accuracy using the logistic activation function: 0.999444
Training accuracy using the tanh activation function: 1.000000

Fortunately, this algorithm is much easier to implement and debug than multi-layer perceptron :).
I will push a test file soon.

@ogrisel , @larsmans
> @ogrisel I use inkscape to generate these figures. The issue is, to
> compile the generated inkscape latex would require the relevant pdf as
> well, so the latex code isn't that portable. Should I recreate them in
> graphviz ?

I would say yes: we would like all figures in the documentation to be
easy to re-create.