Add implementation for the rest of the insertion modes

"in table text", "in caption", "in column group", "in table body", "in row", "in cell", "in select",
"in select in table", "in template", "after body", "in frameset", "after frameset",
"after after body", "after after frameset"

HTMLKit/HTMLParser.h

@@ -10,6 +10,4 @@
 
 @interface HTMLParser : NSObject
 
-- (id)adjustedCurrentNode;
-
 @end

HTMLKit/HTMLStackOfOpenElements.m

@@ -57,12 +57,12 @@
 
 - (HTMLElement *)firstNode
 {
-	return _stack.lastObject;
+	return _stack.firstObject;
 }
 
 - (HTMLElement *)lastNode
 {
-	return _stack.firstObject;
+	return _stack.lastObject;
 }
 
 - (id)objectAtIndexedSubscript:(NSUInteger)index;