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Yamagishi Kazutoshi 459bbfa4b2 Prevent selection of unacceptable Content-Type files ()
* Prevent selection of unacceptable Content-Type files

* replace hard code

* media_attachments accept content-types in initial state
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index.html.haml Added haml-lint and fix warnings ()
initial_state.json.rabl Prevent selection of unacceptable Content-Type files ()