text: Implement a Network Size method
  -------------------------------
  Key: NET-281
  URL:
  Project: Commons Net
  Issue Type: New Feature
  Environment: All
  Reporter: Scott Davis
  Priority: Trivial
  Implement a size method in the SubnetUtils.SubnetInfo class.
  Something similiar to this:
  public int getSize() {
  return (this.broadcast - this.network) + 1;
  }
  We add one so that we include the network address as being in the network range. This will
  also return the same value as the similiar Net::IP class in perl (I was converting a perl
  module to a java class that uses the Net::IP size method).
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