Add CommitTransactionProtocol

Add new protocol which manages the entire process of taking a signed transaction ready
for notarisation, through notarisation and onto recording it both locally and informing
remote nodes.

This protocol also optionally can include the ClientToServiceCommand which triggered a transaction
being created, to give the remote nodes context on why a change occurred (i.e. "You are being sent
£100")

src/main/kotlin/com/r3corda/demos/RateFixDemo.kt

@@ -87,7 +87,7 @@ fun main(args: Array<String>) {
     val tx = TransactionType.General.Builder(notaryNode.identity)
     tx.addOutputState(TransactionState(Cash.State(1500.DOLLARS `issued by` node.storage.myLegalIdentity.ref(1), node.keyManagement.freshKey().public), notaryNode.identity))
     val protocol = RatesFixProtocol(tx, rateOracle.identity, fixOf, expectedRate, rateTolerance)
-    node.smm.add("demo.ratefix", protocol).get()
+    node.services.startProtocol("demo.ratefix", protocol).get()
     node.stop()
 
     // Show the user the output.

src/main/kotlin/com/r3corda/demos/TraderDemo.kt

@@ -182,7 +182,7 @@ private fun runSeller(node: Node, amount: Amount<Currency>, otherSide: Party) {
         tradeTX = node.smm.findStateMachines(TraderDemoProtocolSeller::class.java).single().second
     } else {
         val seller = TraderDemoProtocolSeller(otherSide, amount)
-        tradeTX = node.smm.add("demo.seller", seller)
+        tradeTX = node.services.startProtocol("demo.seller", seller)
     }
 
     tradeTX.success {
@@ -217,7 +217,7 @@ private fun runBuyer(node: Node, amount: Amount<Currency>) {
         // We use a simple scenario-specific wrapper protocol to make things happen.
         val otherSide = message.data.deserialize<Party>()
         val buyer = TraderDemoProtocolBuyer(otherSide, attachmentsPath, amount)
-        node.smm.add("demo.buyer", buyer)
+        node.services.startProtocol("demo.buyer", buyer)
     }
 }