Little fix on shooters index view

[#281]
276-Contest-index-view

Ready
Merge pull request #194 from gotar/276-Contest-view

276-Contest-index-view
Merge pull request #193 from gotar/281-shooters-index-view

Little fix to shooters index view
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
205-competition-show-view