added some doc strings, added ‘indent’ to modelIO class

machineLearning/metric/confusionMatrix.py

machineLearning/metric/regressionScores.py

machineLearning/nn/layer/activation.py

machineLearning/nn/layer/convolution1D.py

machineLearning/nn/layer/graph.py

machineLearning/nn/layer/linear.py

machineLearning/nn/layer/pooling1d.py

machineLearning/nn/layer/pooling2d.py

machineLearning/nn/layer/regularization.py

machineLearning/nn/layer/rnn.py

machineLearning/rf/featureSelection.py

machineLearning/utility/modelIO.py

machineLearning/utility/trainingObservables.py