Added more code to the Network.java class.
Implemented NeuralNetBuilder.java class.
Added Network.toString method.
Merge remote-tracking branch 'origin/develop'

Conflicts:
	core/src/main/java/com/neuralnetwork/core/Main.java
	shared/src/main/java/com/neuralnetwork/shared/nodes/AbstractInputNeuron.java
	shared/src/main/java/com/neuralnetwork/shared/nodes/Neuron.java
	shared/src/main/java/com/neuralnetwork/shared/util/NeuralNetBuilder.java