#25 Added vacations

Added CRUD, views and tests.
![zrzut ekranu z 2014-08-25 14 33 59](https://cloud.githubusercontent.com/assets/6718923/4029822/9de74a28-2c55-11e4-8fcd-622cd38ac950.png)
![zrzut ekranu z 2014-08-25 14 34 09](https://cloud.githubusercontent.com/assets/6718923/4029827/a4a20aba-2c55-11e4-9ba2-53d8e0c63e48.png)
![zrzut ekranu z 2014-08-25 14 34 18](https://cloud.githubusercontent.com/assets/6718923/4029834/adee56aa-2c55-11e4-9182-e8ce97e1fdc6.png)
![zrzut ekranu z 2014-08-25 14 34 32](https://cloud.githubusercontent.com/assets/6718923/4029838/b39fefb4-2c55-11e4-8cba-59130def6e62.png)