Merge pull request #21 from CJentzsch/master

Defined SMOD more precisely
Bytes past the end in a PUSH are 0.
Merge branch 'master' of github.com:ethereum/latexpaper
Added DUP* and SWAP*.
Prepped LOG* and CALLCODE.
Removed DUP & SWAP.
More spec for CALLCODE.
EXTCODE*
Instruction reorg and extra AL ops.
More specific over SHA-3
No minimum gas price.
Zero ranges don't increase memory size.
Prices *COPY, EXP.
Empty Trie is the SHA3(rlp('')), not empty string.
New uncle rewards.
Minor fix.
Modified GHOST: allow multiple gnerations of uncles.
More explicit about account creation.
Alterations to the transaction execution description; unfinished but better.
1024 max call depth.
Refunds for SSTORE.
Jump destinations defined.