Added method in DataSetLabelBinarySeparator to recombine the separated labels.

Implemented its use in NeuralNetworkTester to prepare instance data for test
metrics

Improved code in AccuracyTestMetric

Added constructor to ConfusionMatrixTestMetric to pull discrete ranges out of
the DataSetDescription
Merge pull request #11 from theJenix/tester_fix

Added method in DataSetLabelBinarySeparator to recombine the separated l...