WorldEdit.getBlock (and its callers) can now throw any WorldEditException.
Added LocalPlayer.getBlockInHand().

Also added an appropriate overload to BukkitPlayer.
Added BlockType.getBlockForItem.
Added an item->block mapping for LocalPlayer.getBlockInHand().
Added a "hand" pseudo block type that uses the currently selected block.
Added a "pos1" pseudo block type, which uses the block type from the "primary position".
Merge pull request #277 from sk89q/hand

Added "hand" and "pos1" pseudo block types that use the current quickbar slot and the block at the current pos1, respectively.