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Enable active_storage to upload image locally for #275
When I test locally, it requires
libvips
.In ubuntu we can install by
sudo apt install libvips-dev
In heroku, please refer to lovell/sharp#57 to install
libvips
default image caption is not center by picture width

The picture title(caption) behaves weired since caption center according to the full filed width, not image width.
so I adjusted the style a bit to center by image width
