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/GTMNSString+URLArguments.m

@@ -0,0 +1,45 @@
+//
+//  GTMNSString+URLArguments.m
+//
+//  Copyright 2006-2008 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.
+//
+
+#import "GTMNSString+URLArguments.h"
+#import "GTMGarbageCollection.h"
+
+@implementation NSString (GTMNSStringURLArgumentsAdditions)
+
+- (NSString*)gtm_stringByEscapingForURLArgument {
+  // Encode all the reserved characters, per RFC 3986
+  // (<http://www.ietf.org/rfc/rfc3986.txt>)
+  CFStringRef escaped = 
+    CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
+                                            (CFStringRef)self,
+                                            NULL,
+                                            (CFStringRef)@"!*'();:@&=+$,/?%#[]",
+                                            kCFStringEncodingUTF8);
+  return GTMCFAutorelease(escaped);
+}
+
+- (NSString*)gtm_stringByUnescapingFromURLArgument {
+  NSMutableString *resultString = [NSMutableString stringWithString:self];
+  [resultString replaceOccurrencesOfString:@"+"
+                                withString:@" "
+                                   options:NSLiteralSearch
+                                     range:NSMakeRange(0, [resultString length])];
+  return [resultString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+}
+
+@end