new consistency check for token filters in 4.5.1

[Benson Margulies]

  My token filter has no end() method at all. Am I required to have an end
method()?

BaseLinguisticsTokenFilterTest.testSegmentationReadings:175->Assert.assertTrue:41->Assert.fail:88
super.end()/clearAttributes() was not called correctly in end()

BaseLinguisticsTokenFilterTest.testSpacesInLemma:189->Assert.assertTrue:41->Assert.fail:88
super.end()/clearAttributes() was not called correctly in end()