fixes #171: no longer allow callouts on cluster annotations

@@ -27,6 +27,7 @@
 
 #import "RMMapLayer.h"
 #import "RMPixel.h"
+#import "RMAnnotation.h"
 
 @implementation RMMapLayer
 
@@ -34,7 +35,7 @@
 @synthesize projectedLocation;
 @synthesize draggingEnabled;
 @synthesize userInfo;
-@synthesize canShowCallout;
+@synthesize canShowCallout=_canShowCallout;
 @synthesize calloutOffset;
 @synthesize leftCalloutAccessoryView;
 @synthesize rightCalloutAccessoryView;
@@ -70,6 +71,12 @@
     [super dealloc];
 }
 
+- (void)setCanShowCallout:(BOOL)canShowCallout
+{
+    if ( ! self.annotation.isClusterAnnotation)
+        _canShowCallout = canShowCallout;
+}
+
 - (void)setPosition:(CGPoint)position animated:(BOOL)animated
 {
     [self setPosition:position];

@@ -1548,7 +1548,7 @@
         [self deselectAnnotation:_currentAnnotation animated:( ! [hit isKindOfClass:[RMMarker class]])];
     }
 
-    if ( ! [hit isKindOfClass:[CALayer class]])
+    if ( ! hit)
     {
         [self singleTapAtPoint:[recognizer locationInView:self]];
         return;