Fixed bug in CascadeNetworkExpansionReactionStrategy.

It incorrectly determined the size of the output layer,
which caused some issues when new weights are added.
Predator-Prey PSO
TwoStep PSO
Merge pull request #129 from censlin/CNBug

Correct CascadeNetworkExpansionReactionStrategy.
Merge pull request #141 from robgarden/predPrey

Predator-Prey PSO
Merge pull request #142 from robgarden/twoStep

TwoStep PSO