o use NSURLConnection for network tile fetches

o retryCount and waitSeconds as properties
(Closes #23 and #24)

@@ -28,11 +28,14 @@
 #import "RMAbstractMercatorTileSource.h"
 #import "RMProjection.h"
 
-#define RMAbstractWebMapSourceRetryCount  3
-#define RMAbstractWebMapSourceWaitSeconds 2
+#define RMAbstractWebMapSourceDefaultRetryCount  3
+#define RMAbstractWebMapSourceDefaultWaitSeconds 15.0
 
 @interface RMAbstractWebMapSource : RMAbstractMercatorTileSource
 
+@property (nonatomic, assign) NSUInteger retryCount;
+@property (nonatomic, assign) NSTimeInterval waitSeconds;
+
 - (NSURL *)URLForTile:(RMTile)tile;
 
 // Tilesources with layers use this method.

@@ -31,11 +31,16 @@
 
 @implementation RMAbstractWebMapSource
 
+@synthesize retryCount, waitSeconds;
+
 - (id)init
 {
     if (!(self = [super init]))
         return nil;
-    
+
+    self.retryCount = RMAbstractWebMapSourceDefaultRetryCount;
+    self.waitSeconds = RMAbstractWebMapSourceDefaultWaitSeconds;
+
     return self;
 }
 
@@ -74,12 +79,12 @@
     //
     NSMutableArray *tilesData = [NSMutableArray arrayWithCapacity:[URLs count]];
 
-    for (int p = 0; p < [URLs count]; p++)
+    for (int p = 0; p < [URLs count]; ++p)
         [tilesData addObject:[NSNull null]];
 
     dispatch_group_t fetchGroup = dispatch_group_create();
 
-    for (int u = 0; u < [URLs count]; u++)
+    for (int u = 0; u < [URLs count]; ++u)
     {
         NSURL *currentURL = [URLs objectAtIndex:u];
 
@@ -87,11 +92,11 @@
         {
             NSData *tileData = nil;
 
-            for (int try = 0; try < RMAbstractWebMapSourceRetryCount; try++)
+            for (int try = 0; tileData == nil && try < self.retryCount; ++try)
             {
-                if ( ! tileData)
-                    // Beware: dataWithContentsOfURL is leaking like hell. Better use AFNetwork or ASIHTTPRequest
-                    tileData = [NSData dataWithContentsOfURL:currentURL options:NSDataReadingUncached error:NULL];
+                NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:currentURL];
+                [request setTimeoutInterval:(self.waitSeconds / (CGFloat)self.retryCount)];
+                tileData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
             }
 
             if (tileData)
@@ -108,7 +113,7 @@
 
     // wait for whole group of fetches (with retries) to finish, then clean up
     //
-    dispatch_group_wait(fetchGroup, dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * RMAbstractWebMapSourceWaitSeconds));
+    dispatch_group_wait(fetchGroup, dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * self.waitSeconds));
     dispatch_release(fetchGroup);
 
     // composite the collected images together

@@ -463,7 +463,7 @@
                     }
 
                     averageX /= (double)enclosedAnnotationsCount;
-                    averageY /= (double) enclosedAnnotationsCount;
+                    averageY /= (double)enclosedAnnotationsCount;
 
                     double halfClusterMarkerWidth = clusterMarkerSize.width / 2.0,
                            halfClusterMarkerHeight = clusterMarkerSize.height / 2.0;