* lib/tempfile.rb: fix confusing inspect.

  previous Tempfile#inspect says it is a File, but actually
  it is not a File.

    t = Tempfile.new("foo") #=> #<File:/tmp/foo20121106-31970-1ffbum0>
    t.is_a? File #=> false

  now Tempfile#inspect returns like:

    t = Tempfile.new("foo")
    #=> #<Tempfile:/tmp/foo20121106-31970-1ffbum0>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37492 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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