fix test code
mod spec/app_spec.rb

Signed-off-by: kiyoto.onozawa <kiyoto.onozawa@mixi.co.jp>
Merge remote-tracking branch 'remotes/upstream/problems' into problems

Conflicts:
	spec/app_spec.rb
Solve "1.404を表示するページ"
Solve "2.500を表示するページ"

Signed-off-by: kiyoto.onozawa <kiyoto.onozawa@mixi.co.jp>