Set indentation settings to four spaces at the project level

Remake of 95b4f6c97977ed463d0d145806028e16d1a0f66e ;-)

AFNetworking.xcodeproj/project.pbxproj

@@ -453,7 +453,10 @@
 				298D7C561BC2C88F00FD3B3E /* Tests */,
 				2995223A1BBF104D00859F49 /* Products */,
 			);
+			indentWidth = 4;
 			sourceTree = "<group>";
+			tabWidth = 4;
+			usesTabs = 0;
 		};
 		2995223A1BBF104D00859F49 /* Products */ = {
 			isa = PBXGroup;

Example/AFNetworking Example.xcodeproj/project.pbxproj

@@ -268,7 +268,10 @@
 				29E6F1E71BB9E37200A4466C /* Frameworks */,
 				29E6F1761BB9DCB500A4466C /* Products */,
 			);
+			indentWidth = 4;
 			sourceTree = "<group>";
+			tabWidth = 4;
+			usesTabs = 0;
 		};
 		29E6F1761BB9DCB500A4466C /* Products */ = {
 			isa = PBXGroup;