Lowering prices

[nirosu]

Acacia wood, Dark oak wood, are now a regular part of the woods, and have no reason to stay so expensive after this long, along with perhaps a few other 1.7 items.

Also, nether brick items should be lowered, stairs cost 35 a piece, and that's unreasonable as you can now(since like 1.... ?1.3?) make nether bricks out of netherrack.

[Stoux]

Log prices are now the same as the other ones.

Lowered the Stairs by 10$.