haven 2.0.0

BREAKING CHANGES

• labelled() and labelled_spss() now produce objects with class
  "haven_labelled" and "haven_labelled_spss". Previously, the "labelled"
  class name clashed with the labelled class defined by Hmisc (#329).

  Unfortunately I couldn't come up with a way to fix this problem except
  to change the class name; it seems reasonable that haven should be the one
  to change names given that Hmisc has been around much longer. This
  will require some changes to packages that use haven, but shouldn't
  affect user code.

Minor improvements

• labelled() and labelled_spss() now support adding the label
  attribute to the resulting object. The label is a short,
  human-readable description of the object, and is now also used
  when printing, and can be easily removed using the new zap_label()
  function. (#362, @huftis)

  Previously, the label attribute was supported both when reading
  and writing SPSS files, but it was not possible to actually create
  objects in R having the label attribute using the constructors
  labelled() or labelled_spss().