Update Simple and Echo Xcode projects to fix crashes and use new API.

Examples/Echo/Xcode/Echo/EchoViewController.swift

@@ -107,7 +107,7 @@ class EchoViewController : NSViewController, NSTextFieldDelegate {
       return
     }
     if (TLSButton.intValue == 0) {
-      service = Echo_EchoService(address:address)
+      service = Echo_EchoService(address:address, secure:false)
     } else {
       let certificateURL = Bundle.main.url(forResource: "ssl",
                                            withExtension: "crt")!

Examples/Echo/Xcode/README.md

@@ -0,0 +1,10 @@
+# Echo gRPC Sample App
+
+The Echo Xcode project contains a Mac app that can be used to 
+instantiate and run local gRPC clients and servers. It depends
+on the gRPC Xcode project, which requires a local build of the
+gRPC Core C library. To build that, please run "make" in the
+root of your gRPC distribution. Next use Xcode's "Add Files..."
+command to add the SwiftGRPC.xcodeproj to your project and
+then add the CzLib, gRPC, CgRPC, and BoringSSL libraries
+to the target dependencies of "Echo".

Examples/Simple/Xcode/README.md

@@ -9,7 +9,10 @@ The Simple Xcode project contains a Mac app that can be used to
 instantiate and run local gRPC clients and servers. It depends
 on the gRPC Xcode project, which requires a local build of the
 gRPC Core C library. To build that, please run "make" in the
-root of your gRPC distribution.
+root of your gRPC distribution. Next use Xcode's "Add Files..."
+command to add the SwiftGRPC.xcodeproj to your project and
+then add the CzLib, gRPC, CgRPC, and BoringSSL libraries
+to the target dependencies of "Simple".
 
 When running the app, use the "New" menu option to create new
 gRPC sessions. Configure each session using the host and port
@@ -17,5 +20,3 @@ fields and the client/server selector, and then press "start"
 to begin serving or calling the server that you've specified.
 
 See the "Document" class for client and server implementations.
-
-

Examples/Simple/Xcode/Simple/Document.swift

@@ -137,7 +137,7 @@ class Document: NSDocument {
       self.log("Client Starting")
       self.log("GRPC version " + gRPC.version())
 
-      self.channel = gRPC.Channel(address:address)
+      self.channel = gRPC.Channel(address:address, secure:false)
       self.channel.host = "foo.test.google.fr"
       let messageData = "hello, server!".data(using: .utf8)