Add a guest name generator

[InfectedBytes]

Superseed loicteixeira#19

Guest name generator! When saving a score for a guest, it will show the name of the guest followed by "(guest)" on the website, but because the default name is "Guest", it actually shows "Guest (guest)" which is pretty lame. Unless you specify a name yourself, it would be nice to add random names like Mario/Luigi/Sonic/etc (and possibly allow the use of custom lists to match a game universe).

[psenakdotsk]

its actually like really easy to implement yourself