Update version history for 5.0.6
Remove documentation note from 5.0.6 list
Merge pull request #1416 from melissalinkert/rebased/develop/5.0.6-history

Update version history for 5.0.6 (rebased onto develop)
Update auto-generated documentation

Repository: openmicroscopy/bioformats
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Generated by BIOFORMATS-5.1-latest-docs-autogen#191 (http://ci.openmicroscopy.org/job/BIOFORMATS-5.1-latest-docs-autogen/191/)