Drivers: Add DriverListFragment

For now we can see the list of Formula One drivers.
For each driver, we can see a picture,the driver name,
and the country of origin.
In the future, each driver will have their own avatar.

* I would like to thank Evelio Tarazona Cáceres, for letting
  me use his solution to get rounded pictures. You can find
  all the info here:
  > http://evel.io/2013/07/21/rounded-avatars-in-android.

Signed-off-by: AlvaroOrduna <alvaro.orduna.92@gmail.com>