Make timestamped backup copies
Update update_pivot script to match new imagekit cache layout
Do not force encoding when writing to stderr

It looks like the underlying OutputWrapper handles encoding itself.
Add default value for ExhibitionInstance.illustration
Update requirements
Add tipsy css/js to pivot view
Move action button definition to main michaux.css
Add navbar access to the Exhibitions view
Use dataTables for Exhibitions view
Use lowercase for field names
Use singular for collection
Move dataTables info line at the top
Move lightbox/imagebox styling to main michaux.css file

It is also used in the Work view
Implement /base/bibliography/ table view
Allow empty firstname field for Owner
Remove linebreak conversion from comment field
Fix Owner standard representation
Add /base/bibliography link to navbar
Add signature property
Default size has been changed to 240