added competition#show view


![205-competition-show-view-screen-afterfix](https://cloud.githubusercontent.com/assets/2800299/3077034/e1e6ce04-e40e-11e3-9e4b-72a4004cff2d.png)

added CompetitionHelper
added translation
added test checking whether the competion controller
properly renders show template, added tests for competition/show view and competition helper