added competition#show view
added CompetitionHelper
added translation
added test checking whether the competion controller
properly renders show template, added tests for competition/show view and competition helper
removed the gray background
changed view and adapting changes in models
Merge branch '205-competition-show-view' of github.com:gotar/Internship-range into 205-competition-show-view

Conflicts:
	app/controllers/competitions_controller.rb
	app/helpers/competition_helper.rb
	app/views/competitions/show.html.haml
	spec/controllers/competitions_controller_spec.rb
	spec/helpers/competition_helper_spec.rb
	spec/views/competitions/show.html.haml_spec.rb
made the display_shots and display_sum methods work properly