Add current location property to Input Stream reader

Can be used for better parse errors reporting

HTMLKit/HTMLInputStreamReader.h

@@ -16,6 +16,7 @@
 @interface HTMLInputStreamReader : NSObject
 
 @property (nonatomic, readonly) NSString *string;
+@property (nonatomic, readonly) NSUInteger currentLocation;
 @property (nonatomic, copy) HTMLStreamReaderErrorCallback errorCallback;
 
 - (id)initWithString:(NSString *)string;

HTMLKit/HTMLInputStreamReader.m

@@ -26,6 +26,7 @@
 
 @implementation HTMLInputStreamReader
 @synthesize string = _string;
+@synthesize currentLocation = _location;
 @synthesize errorCallback = _errorCallback;
 
 #pragma mark - Lifecycle