Update tokenizer implementation as per spec as of 2017.09.09

- Use new initial states in tests according to:
html5lib/html5lib-tests#101

- Implement tokenization errors introduced in:
whatwg/html#2701
html5lib/html5lib-tests#92

Author: iabudiab

Sources/HTMLParseErrorToken.m

@@ -33,6 +33,20 @@ - (instancetype)initWithCode:(NSString *)code details:(NSString *)details locati
 	return self;
 }
 
+- (BOOL)isEqual:(id)other
+{
+	if ([other isKindOfClass:[self class]]) {
+		HTMLParseErrorToken *token = (HTMLParseErrorToken *)other;
+		return bothNilOrEqual(self.code, token.code);
+	}
+	return NO;
+}
+
+- (NSUInteger)hash
+{
+	return self.code.hash + self.code.hash;
+}
+
 - (NSString *)description
 {
 	return [NSString stringWithFormat:@"<%@: %p Code='%@' Details='%@' Location='%lu'>", self.class, self, _code, _details, (unsigned long)_location];