Update to google maps JS version 3.20
Update to google maps JS version 3.20

cr3ative/StoryMapJS,1modm/StoryMapJS,1modm/StoryMapJS,wangjun/StoryMapJS,1modm/StoryMapJS,BenHeubl/StoryMapJS,jorol/StoryMapJS,1modm/StoryMapJS,cr3ative/StoryMapJS,cr3ative/StoryMapJS,cr3ative/StoryMapJS,jorol/StoryMapJS,wangjun/StoryMapJS,BenHeubl/StoryMapJS,jorol/StoryMapJS,wangjun/StoryMapJS,jorol/StoryMapJS,BenHeubl/StoryMapJS,wangjun/StoryMapJS,BenHeubl/StoryMapJS