ext.rifle: implemented asking on unknown filetype (in ranger only)

this was requested here: https://github.com/hut/ranger/issues/36

adam8157:
  Why non-text files' default opener is editor now? It invoked open_with
  before.

  I think the old way is better. We can't describe all types in
  rifle.conf, so many types are defined as unknown non-text types, it's
  not appropriate to open them all with editor.

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