Support for texture IDs

[Vankka]

The ability to request a player head directly via texture id, http://textures.minecraft.net/texture/<texture id>, for example http://textures.minecraft.net/texture/f4f5b52d9ad21cfa175c4bde8314be44ea0c448afe531939e1a22ed11a665c77

Why?

Avoiding the cache that's bound to the UUID, querying by texture id directly would result in having the right head, right after the player's skin is changed.

Or if the (online) UUID isn't known but the texture id is, that would avoid 2 requests (username->uuid & uuid->profile)

[astei]

Sorry for the late response on this one, I've been caught up in other stuff.

I'm happy to work on this over the holiday break.

[FN-FAL113]

Up for this, very handy