Fix score board. Rename Submit to Submission.
Fix Group to calculate score.
Fix wrong private specifier.
Fix score board. Rename Submit to Submission.
Fix Group to calculate score.
Fix score board.
Fix score board,
Merge branch '109_score_board' of github.com:TakenokoChocoHolic/wpcs into 109_score_board

Conflicts:
	app/controllers/contests/problems_controller.rb
	app/models/group.rb
	app/models/problem.rb
	app/views/contests/scores/show.html.erb
Merge branch '109_score_board' of github.com:TakenokoChocoHolic/wpcs into 109_score_board
Rename some methods.
Change for loop to each method.
Fix method names.
Use symbols instead of strings.
Fix score board and problem page.
Fix score board. Close #109
Merge pull request #125 from TakenokoChocoHolic/109_score_board

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

Fix submission history. Close #91