added test purl parameter
Prior view now generates graphs
config changes for previous
Functional previews for single priors
gitignore, table view changes

putting preview images in gitignore, they aren't hard to generate.
Finished up table view
Changes to .gitignore
Revert "Changes to .gitignore"

This reverts commit 1d4dd1bbec9ed669337a26b871addc311b6701c4.
Changed handling of null updated_at

Regenerate prior not never but always.
last minute waffling
Prior previews now link to the larger versions
All prior images pre-generated in case of emergency.
Prior reprettification

Also changed null updated_at from always back to never
gitignore changes
Image removal

Yes this could have been done in one commit, yes I'm a derp.
Style update

Coding style, some html things, graph formatting, etc