Move BUYClient storefront API into category.

Mobile Buy SDK/Mobile Buy SDK.xcodeproj/project.pbxproj

@@ -647,6 +647,8 @@
 		90FC31A71B50371600AFAB51 /* BUYProductViewHeaderBackgroundImageView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = BUYProductViewHeaderBackgroundImageView.m; path = "Product View/BUYProductViewHeaderBackgroundImageView.m"; sourceTree = "<group>"; };
 		9A0B0C641CEA703E0037D68F /* BUYClient+Routing.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "BUYClient+Routing.h"; sourceTree = "<group>"; };
 		9A0B0C651CEA703E0037D68F /* BUYClient+Routing.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "BUYClient+Routing.m"; sourceTree = "<group>"; };
+		9A0B0C6A1CEB4D300037D68F /* BUYClient+Storefront.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "BUYClient+Storefront.h"; sourceTree = "<group>"; };
+		9A0B0C6B1CEB4D300037D68F /* BUYClient+Storefront.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "BUYClient+Storefront.m"; sourceTree = "<group>"; };
 		9A102D1A1CDD1F960026CC43 /* BUYErrorTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYErrorTests.m; sourceTree = "<group>"; };
 		9A102D1D1CDD25980026CC43 /* BUYOptionValueTests.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = BUYOptionValueTests.m; sourceTree = "<group>"; };
 		9A47CEF81CE39EC200A6D5BA /* BUYPaymentToken.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = BUYPaymentToken.h; sourceTree = "<group>"; };