Sharing on Facebook, Twitter and Google+

[FIXED]     Font of navbar.
[FIXED]     A few compile fixes.
[IMPROVED]  Made properties nonatomic.
[ADDED]     Support for facebook, twitter and google+ sharing.

External/google-plus-ios-sdk/OpenSource/GTL/GTLJSONParser.h

@@ -0,0 +1,41 @@
+/* Copyright (c) 2011 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//
+//  GTLJSONParser.h
+//
+
+// This class is a thin wrapper around the JSON parser.  It uses
+// NSJSONSerialization when available, and SBJSON otherwise.
+
+#import <Foundation/Foundation.h>
+
+#import "GTLDefines.h"
+
+@interface GTLJSONParser : NSObject
++ (NSString*)stringWithObject:(id)value
+                humanReadable:(BOOL)humanReadable
+                        error:(NSError**)error;
+
++ (NSData *)dataWithObject:(id)obj
+             humanReadable:(BOOL)humanReadable
+                     error:(NSError**)error;
+
++ (id)objectWithString:(NSString *)jsonStr
+                 error:(NSError **)error;
+
++ (id)objectWithData:(NSData *)jsonData
+               error:(NSError **)error;
+@end