new: Input class + test
new: StepTransferFunction class + test
new: Neuron class + test
new: FeedForwardLayer class + test
new: Network abstract class
new: FeedForwardNetwork class
new: LearningSet class
new: Teacher abstract class
new: FeedForwardTeacher class
new: Maven pom file for examples
new: AND logic operation example
new: OR logic operation example
new: TanhTransferFunction class + test
new: XOR logic operation example