bad optimiz
Revert "parallel simrank"

This reverts commit f050080da883f0d45b9b990105474144a9726e32.

Conflicts:
	examples/data/generic_graph.txt
	examples/scala-parallel-friend-recommendation/2
	examples/scala-parallel-friend-recommendation/3
	examples/scala-parallel-friend-recommendation/src/main/scala/Run.scala