Conflicts:
	core/transaction_pool.go

* big(bytes) == 0 when len(bytes) > 0

* Added additional chain tests
* Added proper mutex' on chain
* Removed ethereum dependencies

* Depth check has been moved to the execution
* Pre compiled execution has been moved to the VM
* PrecompiledAddress has been renamed to PrecompiledAccount

p2p: fix call to Server.removePeer

The gui already waits and shuts down ethereum. There was no need to wait
for an additional shutdown.