added a new class called; networkSet . 
added a new class called; networkSet . 

this class will hold set's of Networks so that set statistics 
can be calculated easilily.



hohe/scikit-rf,aerialist/scikit-rf,jhillairet/scikit-rf,hohe/scikit-rf,hohe/scikit-rf,temmeand/scikit-rf,Ttl/scikit-rf,aerialist/scikit-rf,jhillairet/scikit-rf,Ttl/scikit-rf,scikit-rf/scikit-rf,willhaines/scikit-rf,willhaines/scikit-rf,temmeand/scikit-rf,Ttl/scikit-rf,willhaines/scikit-rf,willhaines/scikit-rf,aerialist/scikit-rf,temmeand/scikit-rf,gibbons/scikit-rf,jhillairet/scikit-rf,scikit-rf/scikit-rf,gibbons/scikit-rf,hohe/scikit-rf,Ttl/scikit-rf,gibbons/scikit-rf