Upped protocol version
Only set TD if it's actually higher
vim error :S
Added pre processing of transaction on the transient state
Improved and simplified wallet functions and behaviour
Show newly created private key during startup. Closes #126
Removed mutan. Closes #183
Skip mining on transactions that don't meet the min accepted gas price
Merge branch 'poc8' into develop
Fixed issue in VM where LOG didn't pop anything of the stack
EXP simplified
upped proto version and modified block pool
Merge branch 'poc8' into develop
First draft of Whisper messages relaying
Proper start/stoping wpeers
Additional checks and debug output
Core changes

* Code = '' if gas < len(D) * 5
* Sha3 gas   10 + 10 * len(D), rounding up 32 bytes
* Sha256 gas 50 + 50 * len(D), rounding up 32 bytes
* Ripmed gas 50 + 50 * len(D), rounding up 32 bytes
* Accounts and value transfers no longer reverted
PV49
Added S256 curve
Added Encrypt & Decrypt using the ECIES w/ tests