Fix submission history. Close #91
Merge pull request #127 from TakenokoChocoHolic/91_history

Fix submission history. Close #91
Fix score board and submission history to show acquired scores. Close #9
Fix scoreboard. Close #126
Fix scoreboard and submission history to show max score.
Merge branch '9_score' of github.com:TakenokoChocoHolic/wpcs into 9_score

Conflicts:
	app/views/contests/problems/index.html.erb
	app/views/contests/scores/show.html.erb