Update version numbers to 5.0.6
Merge pull request #1405 from melissalinkert/5.0.6-history

Update version history for 5.0.6
Merge pull request #1393 from melissalinkert/5.0.6-version

Update version numbers to 5.0.6
merge dev_5_0 -Dorg -Ssuccess-only

Repository: openmicroscopy/bioformats
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Generated by OME-5.0-merge-push#257 (http://ci.openmicroscopy.org/job/OME-5.0-merge-push/257/)