Compressor and new materials.

Add compressor into technic (needs textures!).
New materials (from left to right):
 - Graphite - made by compressing coal dust. Can be used in nuclear reactor later.
 - Carbon cloth - made of graphite.
 - Carbon plate - made by compressing carbon mesh. Light and durable material used in advanced machines.
 - Mixed metal ingot (not an alloy!) - used to create composite plates.
 - Composite plate - advanced heavy and very durable material. Can be used in advanced machines.
 - Copper plate - can be used in some machines as heatsink.
 - Blast-resistant concrete - useless block for now. Can be used later, for example, in nuclear plants to prevent damage from explosion.
![minetest_compressor](https://f.cloud.github.com/assets/171339/759859/b75cd13e-e79c-11e2-8d10-f09717fdb546.png)