Iterator, Entry等の省略 #36

of Iterator etc. and implement collectStandardMethodInvocations(),
collectInvocatoinChains(),
replaceInvocatoinChains().
Add DeltaAliasCollectorTest to test DeltaAliasCollector#shrink().

shrink references of Iterator etc. and implement
collectCollectionReferences(),
collectCollectionChains(),
replaceCollectionChains().
Add test CollaboratoinObjectCallGraphTest#shrinkAll().

, Add CollaborationObjectCallGraph#replaceRelatedPoints(),
DeltaAliasCollector#collectNewToOldMethodExecution().
Fix bug by setting return value in new MethodExecution of
DeltaAliasCollector#replaceInvocationChains().

#3 Fix bug by always drawing the MethodExecutionVertex in foreground.