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0.2.2:
Added initXML(), XMLFromSet() and closeXML() methods to auto-generate training
XML.

train() method can now get XML both from a file and from a simple string.
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0.2.1:
Added `train()` method to NeuralNet class, that allows you to train a neural
network using an XML containing pre-saved training sets (input values,
expected output). See examples/adder.xml for an example of such XML.
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0.2:
Added `save()` method to NeuralNet class, that allows you to save a trained
neural network to a binary file, to load anytime you need using
NeuralNet(const char *fname) constructor.
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0.01b:
First release ^^
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