Merge pull request #167 from mwcraig/new-meta

Fix a number of metadata-related issues with CCDData class
Merge pull request #169 from mwcraig/write-bunit

If data has a unit, put it in FITS header when converting to HDU
Merge pull request #171 from mwcraig/fix-ccddata-logging

Once again, merging immediately because it is a fairly small change.
Update astropy_helpers version
Correctly update astropy_helpers version
Version 0.2.1
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