Merge pull request #137 from jkreft-usgs/master

reworked superseded
Merge pull request #138 from jkreft-usgs/master

Clean up pubs page HTML
Merge pull request #139 from jkreft-usgs/master

error handling on supersedes
Merge pull request #140 from jkreft-usgs/master

contributors now a separate object
Merge pull request #141 from jkreft-usgs/master

enable authors on search
Merge pull request #142 from jkreft-usgs/master

Pretty up links
added flask-images directory and explanatory documentation
Merge pull request #143 from ayan-usgs/master

added flask-images directory and explanatory documentation
Merge remote-tracking branch 'upstream/master'