Do not add affiliation department value if it is a blank string.
Merge pull request #127 from gnott/tweaks

Do not add affiliation department value if it is a blank string.
Do not include author affiliation city if blank in input file.
Re-word CC-BY license text to not use a comma. Fixes #111.
Merge pull request #135 from gnott/tweaks

Tweaks
Merge branch 'master' of github.com:gnott/elife-poa-xml-generation into ejp-to-hw-zip-workflow