[Hama Wiki] Update of "Neuron" by edwardyoon

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The "Neuron" page has been changed by edwardyoon:
https://wiki.apache.org/hama/Neuron

New page:
{{{
/**
 * Abstract class defines the behavior of activation functions
 */
public abstract class Activation {
  ..
}

/**
 * User-defined sigmoid actiavation function
 */
public class Sigmoid extends Activation {

  @Override
  execute(double value) {
    ..
    return result;
  }

}

Job Configuration interface design:

ANNJob ann = new ANNJob();

}}}