COMP: Do not try to add html files twice to the tarballs.
COMP: Do not try to add html files twice to the tarballs.

This addresses warnings like:

  /home/matt/src/ITKExamples/Utilities/CreateTarball.py:95: UserWarning:
  Duplicate name: 'ComputeNormalsOfAMesh/InputMesh.html'

Many of the html files are stored as .md5 content references.

Change-Id: Iad4db1f90c18676e5c3fec1b2dc4523f3e00dafe

InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples,InsightSoftwareConsortium/ITKExamples