Move header files into include directory

Sources/include/HTMLKitDOMExceptions.h

@@ -0,0 +1,14 @@
+//
+//  HTMLKitExceptions.h
+//  HTMLKit
+//
+//  Created by Iska on 17/03/15.
+//  Copyright (c) 2015 BrainCookie. All rights reserved.
+//
+
+extern NSString * const HTMLKitHierarchyRequestError;
+extern NSString * const HTMLKitNotFoundError;
+extern NSString * const HTMLKitNotSupportedError;
+
+extern NSString * const HTMLKitSyntaxError;
+extern NSString * const HTMLKitInvalidCharacterError;