Add debug button to change admin and contestant

This commit will be reverted
Default user is not admin
Fix spec helpers
refs #71
Fix specs for #71
Fix ScoresHelper
Merge pull request #119 from murooka/restrict_admin_page

Restrict admin page
Merge pull request #123 from TakenokoChocoHolic/capybara

Add acceptance tests using Capybara
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