Merge pull request #1528 from mapbox/1516-getter

Adding Getter Method

include/mbgl/ios/MGLAccountManager.h

@@ -1,6 +1,7 @@
 @interface MGLAccountManager : NSObject
 
 + (void) setMapboxMetricsEnabledSettingShownInApp:(BOOL)showsOptOut;
++ (BOOL) mapboxMetricsEnabledSettingShownInApp;
 + (void) setAccessToken:(NSString *) accessToken;
 + (NSString *) accessToken;
 

ios/app/MBXAppDelegate.m

@@ -22,7 +22,7 @@
     if ( ! accessToken) NSLog(@"No access token set. Mapbox vector tiles won't work.");
 
     // Signal To SDK That Opt Out Is In App UI
-//    [MGLAccountManager setShowsOptOutInApp:YES];
+//    [MGLAccountManager setMapboxMetricsEnabledSettingShownInApp:YES];
 
     // Start Mapbox GL SDK
     [MGLAccountManager setAccessToken:accessToken];