Nicer button for stats Type

Replace button by tabs for statsType selection.
Also gives a better support in responsive.

Before : 
![before](https://f.cloud.github.com/assets/1484406/2491945/f06afc90-b207-11e3-8dcd-d800417741cb.png)
![before-responsive](https://f.cloud.github.com/assets/1484406/2491947/09b37da8-b208-11e3-8731-77842c7a9ef9.png)

After : 
![127_0_0_1_8080___stats_players](https://cloud.githubusercontent.com/assets/1484406/2636510/063ec844-be92-11e3-9268-756fdd307268.png)

![127_0_0_1_8080___stats_players](https://cloud.githubusercontent.com/assets/1484406/2636516/1d0d0450-be92-11e3-9bc1-494e640c9669.png)