Resolved some bugs in the miner

* TODO nonce error sometimes persists
* Fixed mining on wrong blocks
* Fixed state error & receipt fail

cmd/mist/assets/qml/views/transaction.qml

@@ -177,7 +177,7 @@ Rectangle {
 					mainContractColumn.state = "ERROR"
 				} else {
 					txResult.text = "Your transaction has been submitted:\n"
-					txOutput.text = res[0].address
+					txOutput.text = res.toString()
 					mainContractColumn.state = "DONE"
 
 					console.log(res)