Blocks from Minecraft 1.6 Snapshots

New blocks from upcoming Minecraft 1.6:
- Hay Block;
- Carpet;
- Hardened Clay;
- Block of Coal.
Blocks from Minecraft 1.6 Snapshots

-Updated up to 13w19a snapshot changes;
-Added Stained Hardened Clay block;
-Aligned wool carpet height to 1 unit/pixel down from 2
Hay block fix

- Draw unused hay tiles (data bits) invisible
Merge pull request #2 from akudeukie/mc_1.6

Minecraft 1.6 (1.6.2) - merging back to master branch