Add initial implementation for HTML Template & Document Fragment

https://html.spec.whatwg.org/multipage/scripting.html#the-template-element

HTMLKit/HTMLTemplate.m

@@ -0,0 +1,34 @@
+//
+//  HTMLTemplate.m
+//  HTMLKit
+//
+//  Created by Iska on 12/04/15.
+//  Copyright (c) 2015 BrainCookie. All rights reserved.
+//
+
+#import "HTMLTemplate.h"
+#import "HTMLDocument.h"
+
+@implementation HTMLTemplate
+
+- (instancetype)init
+{
+	self = [super initWithTagName:@"template"];
+	return self;
+}
+
+- (HTMLDocumentFragment *)content
+{
+	if (_content == nil) {
+		_content = [[HTMLDocumentFragment alloc] initWithDocument:self.ownerDocument.associatedInertTemplateDocument];
+	}
+
+	return _content;
+}
+
+- (NSOrderedSet *)childNodes
+{
+	return self.content.childNodes;
+}
+
+@end