Merge pull request #1136 from mapbox/1069-annotations-threadsafe-followup

Make sure the app terminates correctly

src/mbgl/map/map.cpp

@@ -137,6 +137,7 @@ void Map::start(bool startPaused) {
         // Closes all open handles on the loop. This means that the loop will automatically terminate.
         asyncRender.reset();
         asyncUpdate.reset();
+        asyncInvoke.reset();
         asyncTerminate.reset();
     });
 
@@ -148,7 +149,6 @@ void Map::start(bool startPaused) {
         processTasks();
     });
 
-
     asyncRender = util::make_unique<uv::async>(env->loop, [this] {
         // Must be called in Map thread.
         assert(Environment::currentlyOn(ThreadType::Map));