New brand identity for Cuberite.

[xoft]

I'd like to explore the possibilities first. I quite like the last one in #49, although I think I'd like it even more without the gear. It has a great clean simplicity, I have no trouble whatsoever imagining this as a program icon (unlike some of the other creations here).

EDIT: Wow, the piston thing looks cool, too. But compared to the SphinxC0re's ones, it is kinda "noisy".