Removed network from MP OS X + initial STM code MP iOS.

[REMOVED]   OS X: Removed networking code.  We're going to use SendToMac
            instead.
[ADDED]     iOS: Initial code for communicating with SendToMac hosts.

MasterPassword/Mac/MPAppDelegate.h

@@ -9,7 +9,7 @@
 #import <Cocoa/Cocoa.h>
 #import "MPPasswordWindowController.h"
 
-@interface MPAppDelegate : NSObject <NSApplicationDelegate, NSNetServiceDelegate>
+@interface MPAppDelegate : NSObject <NSApplicationDelegate>
 
 @property (assign) IBOutlet NSWindow                                    *window;
 
@@ -17,8 +17,6 @@
 @property (readonly, strong, nonatomic) NSManagedObjectModel            *managedObjectModel;
 @property (readonly, strong, nonatomic) NSManagedObjectContext          *managedObjectContext;
 
-@property (readonly, strong, nonatomic) NSNetService                    *netService;
-
 + (NSManagedObjectModel *)managedObjectModel;
 + (NSManagedObjectContext *)managedObjectContext;