Filepicker pick -> store -> remove

pick_store_remove.js.coffee

filepicker.pick picker_options, (pick_fpfile) ->
  sanitized_filename = sanitize_filename(pick_fpfile.filename)

  filepicker.store pick_fpfile, store_options, (store_fpfile) ->
    # Remove files from both fp.io and our root s3 path
    filepicker.remove pick_fpfile, {policy: security.policy, signature: security.signature}