simpleRouterリファクタリングを継続
Merge branch 'devel' of https://github.com/ttsubo/ryu into devel

Conflicts:
	ryu/original/ryu_app/rest_simpleRouter/simpleRouter.py
	ryu/original/tests/unit/test_SimpleRouter.py
simpleRouterのリファクタリングとユニットテスト
Merge branch 'devel' of https://github.com/ttsubo/ryu into devel
test_SimpleForward.pyの修正