"centralised" mining to backend. Closes #323

core/manager.go

@@ -7,12 +7,11 @@ import (
 	"github.com/ethereum/go-ethereum/p2p"
 )
 
-type EthManager interface {
+type Backend interface {
 	BlockProcessor() *BlockProcessor
 	ChainManager() *ChainManager
 	TxPool() *TxPool
 	PeerCount() int
-	IsMining() bool
 	IsListening() bool
 	Peers() []*p2p.Peer
 	KeyManager() *crypto.KeyManager