Bump External dependencies.

External/GooglePlus.framework/Versions/A/Headers/GPPSignInButton.h

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+//
+//  GPPSignInButton.h
+//  Google+ iOS SDK
+//
+//  Copyright 2012 Google Inc.
+//
+//  Use of this SDK is subject to the Google+ Platform Terms of Service:
+//  https://developers.google.com/+/terms
+//
+
+#import <UIKit/UIKit.h>
+
+// The various layout styles supported by the GPPSignInButton.
+// The minmum size of the button depends on the language used for text.
+// The following dimensions (in points) fit for all languages:
+// kGPPSignInButtonStyleStandard: 226 x 48
+// kGPPSignInButtonStyleWide:     308 x 48
+// kGPPSignInButtonStyleIconOnly:  46 x 48 (no text, fixed size)
+typedef enum {
+  kGPPSignInButtonStyleStandard = 0,
+  kGPPSignInButtonStyleWide = 1,
+  kGPPSignInButtonStyleIconOnly = 2
+} GPPSignInButtonStyle;
+
+// The various color schemes supported by the GPPSignInButton.
+typedef enum {
+  kGPPSignInButtonColorSchemeDark = 0,
+  kGPPSignInButtonColorSchemeLight = 1
+} GPPSignInButtonColorScheme;
+
+// This class provides the Google+ sign-in button. You can instantiate this
+// class programmatically or from a NIB file.  You should set up the
+// |GPPSignIn| shared instance with your client ID and any additional scopes,
+// implement the delegate methods for |GPPSignIn|, and add this button to your
+// view hierarchy.
+@interface GPPSignInButton : UIButton
+
+// Sets the sign-in button layout style. The default style is standard.
+- (void)setStyle:(GPPSignInButtonStyle)style;
+
+// Sets the sign-in button color scheme. The default scheme is dark.
+- (void)setColorScheme:(GPPSignInButtonColorScheme)colorScheme;
+
+@end