Merge branch 'pull-181'

* pull-181: (39 commits)
  TST: Remove docstring from test_class_methods.
  DOC: Fix bogus output in polyval example.
  DOC: Improve numpy reference documentation of polynomial classes.
  DOC: Clarify the column order of 2-D and 3-D Vandermonde matrices.
  DOC: Fix cut and paste error, derivative <- integral.
  SPELL: Spellcheck the modules. Clarify an example.
  DOC: Move removing deprecated imports note to deprecation section.
  ENH: Modify test classes to produce more informative test messages.
  WHT: Whitespace cleanup.
  REM: Remove deprecated imports from polynomial package.
  DOC: Document new polynomial package functionality in the release notes.
  DOC: Document the use of the polynomial convenience classes.
  TST: Add tests for NA support in the polynomial fitting functions.
  ENH: Add support for NA to the least squares fitting routines.
  TST: Add tests for mismatched types, domains, and windows.
  BUG: The polynomial convenience classes let different types interact.
  DOC: Lower toc number of levels.
  DOC: Finish documenting new functions in the polynomial package.
  DOC: Document xxxfit functions in the polynomial package modules.
  DOC: Add version added to some of the polynomial package modules.
  ...

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