add two more constructors

- adding two constructors that don't involve
app id easing xamarin development.

Author: Vivek Ayer

iOS_SDK/OneSignal/OneSignal.h

@@ -67,6 +67,10 @@ typedef NS_ENUM(NSUInteger, ONE_S_LOG_LEVEL) {
 
 - (id)initWithLaunchOptions:(NSDictionary*)launchOptions appId:(NSString*)appId handleNotification:(OneSignalHandleNotificationBlock)callback;
 
+- (id)initWithLaunchOptions:(NSDictionary*)launchOptions handleNotification:(OneSignalHandleNotificationBlock)callback autoRegister:(BOOL)autoRegister;
+
+- (id)initWithLaunchOptions:(NSDictionary*)launchOptions autoRegister:(BOOL)autoRegister;
+
 - (id)initWithLaunchOptions:(NSDictionary*)launchOptions appId:(NSString*)appId handleNotification:(OneSignalHandleNotificationBlock)callback autoRegister:(BOOL)autoRegister;
 
 // Only use if you passed FALSE to autoRegister

iOS_SDK/OneSignal/OneSignal.m

@@ -114,6 +114,14 @@ - (id)initWithLaunchOptions:(NSDictionary*)launchOptions appId:(NSString*)appId
     return [self initWithLaunchOptions:launchOptions appId:appId handleNotification:callback autoRegister:true];
 }
 
+- (id)initWithLaunchOptions:(NSDictionary*)launchOptions handleNotification:(OneSignalHandleNotificationBlock)callback autoRegister:(BOOL)autoRegister {
+    return [self initWithLaunchOptions:launchOptions appId:nil handleNotification:callback autoRegister:autoRegister];
+}
+
+- (id)initWithLaunchOptions:(NSDictionary*)launchOptions autoRegister:(BOOL)autoRegister {
+    return [self initWithLaunchOptions:launchOptions appId:nil handleNotification:nil autoRegister:autoRegister];
+}
+
 - (id)initWithLaunchOptions:(NSDictionary*)launchOptions appId:(NSString*)appId handleNotification:(OneSignalHandleNotificationBlock)callback autoRegister:(BOOL)autoRegister {
     self = [super init];