get exif data from Titanium Camera and photoGallery

MediaModule.m

- (void)imagePickerController:(UIImagePickerController *)picker_ didFinishPickingMediaWithInfo:(NSDictionary *)editingInfo
{
    // ...
    // ...

    NSDictionary *metadataDictionary =
    (NSDictionary *)[editingInfo valueForKey:UIImagePickerControllerMediaMetadata];
    [dictionary setObject:metadataDictionary forKey:@"metadata"];

    [self sendPickerSuccess:dictionary];
}