Fix crash when libxml set error in @autoreleasepool

- libxml will return first parsing error instead of last one
- option to replace lower ascii chars with whitespace

RSXMLTests/RSXMLTests.m

@@ -265,6 +265,28 @@
 #pragma clang diagnostic pop
 }
 
+- (void)testLowerAsciiCharacters {
+	NSError *error = nil;
+	RSXMLData *xmlData = [self xmlFile:@"lower-ascii" extension:@"rss"];
+	RSXMLParser *parser = [xmlData getParser];
+	RSParsedFeed *parsedFeed = [parser parseSync:&error];
+	XCTAssertNotNil(error);
+	XCTAssertEqual(parsedFeed.articles.count, 2);
+	parser.dontStopOnLowerAsciiBytes = YES;
+	parsedFeed = [parser parseSync:&error];
+	XCTAssertNil(error);
+	XCTAssertEqual(parsedFeed.articles.count, 5);
+}
+
+- (void)testBrokenXML {
+	NSError *error = nil;
+	RSXMLData *xmlData = [self xmlFile:@"broken" extension:@"rss"];
+	[[xmlData getParser] parseSync:&error];
+	XCTAssertNotNil(error);
+	XCTAssertEqual(error.code, 76);
+	XCTAssertEqualObjects(error.localizedDescription, @"Opening and ending tag mismatch: channel line 0 and rss");
+}
+
 - (void)testDownloadedFeeds {
 	NSError *error = nil;
 	int i = 0;

RSXMLTests/Resources/broken.rss

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
+	xmlns:content="http://purl.org/rss/1.0/modules/content/"
+	xmlns:wfw="http://wellformedweb.org/CommentAPI/"
+	xmlns:dc="http://purl.org/dc/elements/1.1/"
+	xmlns:atom="http://www.w3.org/2005/Atom"
+	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
+	xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
+	>
+
+<channel>
+	<title>Manton Reece</title>
+	<atom:link href="http://www.manton.org/feed" rel="self" type="application/rss+xml" />
+	<link>http://www.manton.org</link>
+	<description></description>
+	<lastBuildDate>Fri, 25 Sep 2015 14:26:40 +0000</lastBuildDate>
+	<language>en-US</language>
+	<sy:updatePeriod>hourly</sy:updatePeriod>
+	<sy:updateFrequency>1</sy:updateFrequency>
+	<generator>http://wordpress.org/?v=4.2.5</generator>
+	<item>
+		<title></title>
+		<link>http://www.manton.org/2015/09/3071.html</link>
+		<comments>http://www.manton.org/2015/09/3071.html#comments</comments>
+		<pubDate>Fri,</pubDate>
+	</item>
+</rss>

RSXMLTests/Resources/lower-ascii.rss

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?><rss version="2.0">
+<channel>
+	<title>Feed Title</title>
+<item>
+		<title>1</title>
+		<link>http://someurl.com/1/</link>
+		<description><![CDATA[Description of first]]></description>
+</item>
+<item>
+		<title>2</title>
+		<link>http://someurl.com/2/</link>
+		<description><![CDATA[Description with  NULL values]]></description>
+</item>
+<item>
+		<title>3</title>
+		<link>http://someurl.com/3/</link>
+		<description><![CDATA[Description of third]]></description>
+</item>
+<item>
+		<title>4</title>
+		<link>http://someurl.com/4/</link>
+		<description><![CDATA[Description of fourth]]></description>
+</item>
+<item>
+		<title>5</title>
+		<link>http://someurl.com/5/</link>
+		<description><![CDATA[Description of fifth]]></description>
+</item>
+	</channel>
+</rss>