Implement a Network Size method
-------------------------------

                 Key: NET-281
                 URL: https://issues.apache.org/jira/browse/NET-281
             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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