205-competition-show-view

Added show view for each competition.
Added count points method https://trello.com/c/IO94G3W7
Added tests
![zrzut ekranu z 2014-05-29 14 25 12](https://cloud.githubusercontent.com/assets/6718923/3117437/e6b40a02-e72c-11e3-9cc8-7f6db2ab07e5.png)
![zrzut ekranu z 2014-05-29 14 24 48](https://cloud.githubusercontent.com/assets/6718923/3117438/ea89bc26-e72c-11e3-982a-0e8bbe37d4cb.png)