added marker image cache clear method

@@ -106,7 +106,10 @@ typedef enum {
 *   @param colorHex A color for the marker specified as an HTML hex code.
 *   @param sizeString A size such as `small`, `medium`, or `large`.
 *   @return An initialized RMMarker layer. */
- - (id)initWithMapBoxMarkerImage:(NSString *)symbolName tintColorHex:(NSString *)colorHex sizeString:(NSString *)sizeString;
+- (id)initWithMapBoxMarkerImage:(NSString *)symbolName tintColorHex:(NSString *)colorHex sizeString:(NSString *)sizeString;
+
+/** Clears the local cache of Mapbox Marker images. Images are cached locally upon first use so that if the application goes offline, markers can still be used. */
++ (void)clearCachedMapBoxMarkers;
 
 /** @name Altering Labels */
 

@@ -152,6 +152,13 @@
     return [self initWithUIImage:[UIImage imageWithData:[NSData dataWithContentsOfFile:cachePath] scale:(useRetina ? 2.0 : 1.0)]];
 }
 
++ (void)clearCachedMapBoxMarkers
+{
+    for (NSString *filePath in [[NSFileManager defaultManager] contentsOfDirectoryAtPath:kCachesPath error:nil])
+        if ([[filePath lastPathComponent] hasPrefix:@"pin-"] && [[filePath lastPathComponent] hasSuffix:@".png"])
+            [[NSFileManager defaultManager] removeItemAtPath:[NSString stringWithFormat:@"%@/%@", kCachesPath, filePath] error:nil];
+}
+
 - (void)dealloc
 {
     self.label = nil;