Merge branch 'release/0.6.4' into develop
Storage at changed to return bytes
Removed old chain code
Changed log statements
Extra checks
Write Protocol version to the db so we can perform sanity checks
Minor improvement catching up

* When catching up check linked up the chain of hashes
Log
Don't add ...
Removed old code
Changed level
Merge branch 'master' into develop
Serpent! :-)
Implemented POST
Block size
Updated to latest sha3 implementation. Fixes #48
Added new list type which can embed any slice type
Changed back to FIPS 180
Reset the transient state when a new block's been found
Contract creation address are empty again