Interface Changes

- Added initial splash screen interface with levels easy, medium & hard
- Created board with variable sizes, depending on difficulty level
- Click on element will show a mine
- Right click on element will place a life buoy on the element

![screen shot 2014-12-21 at 17 11 04](https://cloud.githubusercontent.com/assets/687114/5518959/6852e7fa-8934-11e4-8524-31117d439d4b.png)
![screen shot 2014-12-21 at 17 11 18](https://cloud.githubusercontent.com/assets/687114/5518958/68483b8e-8934-11e4-872d-7741420e95eb.png)