SimpleGraph: fixed connect()
UnmodifiableVerticeList: changed "return false" to "throw new
UnsupportedOperationException"
GraphReader: added convertVerticeIndex()
ContractionGraph: made to extend SimpleGraph, changed a lot
MultipleGraphReader: removed graphFiller, sizeCounter, added reader,
removed setSize call
deleted: AbstractGraphFiller, AbstractSizeCounter, GraphFiller,
SimpleSizeCounter, SizeCounter
Graph: made to extend Iterable<Vertice>
Revert "Graph: made to extend Iterable<Vertice>"

This reverts commit 13448c79113e7b3dd2380ab76477238912c04ad1.
Graph: made to extend Iterable<Vertice>
SimpleGraph: implements Iterable<Vertice>
DepthFirstSearch: changed graph.values() to graph
TestDepthFirstSearch: changed graph.values() to graph
RandomContraction: added vertices for proper randomization