fixes #115: add SSL support

@@ -69,6 +69,15 @@ typedef enum : NSUInteger {
 *   @return An initialized MapBox tile source. */
 - (id)initWithMapID:(NSString *)mapID;
 
+/** Initialize a tile source using the MapBox map ID, optionally enabling SSL.
+*
+*   This method requires a network connection in order to download the TileJSON used to define the tile source.
+*
+*   @param mapID The MapBox map ID string, typically in the format `<username>.map-<random characters>`.
+*   @param enableSSL Whether to use SSL-enabled HTTPS connections for map tiles and other related data. Defaults to `NO`. At some point in the future, this will default to `YES`. 
+*   @return An initialized MapBox tile source. */
+- (id)initWithMapID:(NSString *)mapID enablingSSL:(BOOL)enableSSL;
+
 /** Initialize a tile source with either a remote or local TileJSON structure.
 *
 *   Passing a remote URL requires a network connection. If offline functionality is desired, you should cache the TileJSON locally at a prior date, then pass a file path URL to this method.
@@ -93,6 +102,16 @@ typedef enum : NSUInteger {
 *   @return An initialized MapBox tile source. */
 - (id)initWithMapID:(NSString *)mapID enablingDataOnMapView:(RMMapView *)mapView;
 
+/** For TileJSON 2.1.0+ layers, initialize a tile source and automatically find and add annotations from [simplestyle](http://mapbox.com/developers/simplestyle/) data, optionally enabling SSL.
+*
+*   This method requires a network connection in order to download the TileJSON used to define the tile source.
+*
+*   @param mapID The MapBox map ID string, typically in the format `<username>.map-<random characters>`.
+*   @param mapView A map view on which to display the annotations.
+*   @param enableSSL Whether to use SSL-enabled HTTPS connections for map tiles and other related data. Defaults to `NO`. At some point in the future, this will default to `YES`.
+*   @return An initialized MapBox tile source. */
+- (id)initWithMapID:(NSString *)mapID enablingDataOnMapView:(RMMapView *)mapView enablingSSL:(BOOL)enableSSL;
+
 /** For TileJSON 2.1.0+ layers, initialize a tile source and automatically find and add annotations from [simplestyle](http://mapbox.com/developers/simplestyle/) data.
 *   @param tileJSON A string containing TileJSON.
 *   @param mapView A map view on which to display the annotations. 

@@ -61,7 +61,12 @@
 
 - (id)initWithMapID:(NSString *)mapID
 {
-    return [self initWithMapID:mapID enablingDataOnMapView:nil];
+    return [self initWithMapID:mapID enablingSSL:NO];
+}
+
+- (id)initWithMapID:(NSString *)mapID enablingSSL:(BOOL)enableSSL
+{
+    return [self initWithMapID:mapID enablingDataOnMapView:nil enablingSSL:enableSSL];
 }
 
 - (id)initWithTileJSON:(NSString *)tileJSON
@@ -155,13 +160,18 @@
     
     if ([[referenceURL pathExtension] isEqualToString:@"json"] && (dataObject = [NSString brandedStringWithContentsOfURL:referenceURL encoding:NSUTF8StringEncoding error:nil]) && dataObject)
         return [self initWithTileJSON:dataObject enablingDataOnMapView:mapView];
-    
+
     return nil;
 }
 
 - (id)initWithMapID:(NSString *)mapID enablingDataOnMapView:(RMMapView *)mapView
 {
-    NSString *referenceURLString = [NSString stringWithFormat:@"http://a.tiles.mapbox.com/v3/%@.json", mapID];
+    return [self initWithMapID:mapID enablingDataOnMapView:mapView enablingSSL:NO];
+}
+
+- (id)initWithMapID:(NSString *)mapID enablingDataOnMapView:(RMMapView *)mapView enablingSSL:(BOOL)enableSSL
+{
+    NSString *referenceURLString = [NSString stringWithFormat:@"http%@://api.tiles.mapbox.com/v3/%@.json%@", (enableSSL ? @"s" : @""), mapID, (enableSSL ? @"?secure" : @"")];
 
     return [self initWithReferenceURL:[NSURL URLWithString:referenceURLString] enablingDataOnMapView:mapView];
 }
@@ -175,7 +185,9 @@
 
 - (NSURL *)tileJSONURL
 {
-    return [NSURL URLWithString:[NSString stringWithFormat:@"http://a.tiles.mapbox.com/v3/%@.json", [self.infoDictionary objectForKey:@"id"]]];
+    BOOL useSSL = [[[self.infoDictionary objectForKey:@"tiles"] objectAtIndex:0] hasPrefix:@"https"];
+
+    return [NSURL URLWithString:[NSString stringWithFormat:@"http%@://api.tiles.mapbox.com/v3/%@.json%@", (useSSL ? @"s" : @""), [self.infoDictionary objectForKey:@"id"], (useSSL ? @"?secure" : @"")]];
 }
 
 - (NSURL *)URLForTile:(RMTile)tile