[TIMOB-12938] Android: Google map v2 module, annotation image path inconsistent with standard

*Problem* The file path format for annotation image is not consistent with the standard which should be: '/images/image.png'. Rather in order to get the image the path currently needed to be provided is: 'images/image.png'

MapModule.createAnnotation({
                latitude : 32.943868
                longitude : -96.836114,
                image : imagePath,
                title : 'My Home',
                subtitle : 'Nice place',
                leftButton : leftImage,             
            });

the imagePath is not taken if it is under any folder, doesn't matter it is under folder "android" or not, ( I usually put android specific images under android,), but it works partially when I put the image directly under resource folder, so in a word, 'home.png' works '/img/home.png' will not work, if I don't have the leading slash in the path, having images under folder works, so the imagePath needs to be 'img/abc/home.png', then it can work. However, this is not consistent with current standard.