PlateSlate

remove warning

$ atom lib/plate_slate_web/endpoint.ex

comment out line 4

test setup

$ mkdir -p test/plate_slate_web/query/
$ touch test/plate_slate_web/query/menu_items_test.exs

setup menu resolver

$ atom lib/plate_slate/menu/menu.ex
$ mkdir lib/plate_slate_web/resolvers
$ touch lib/plate_slate_web/resolvers/menu.ex
$ atom lib/plate_slate_web/resolvers/menu.ex