First 'cut' convert units on select change
Remove extraneous log statements
Update calculations and canvas if option units change
Implement convertInput hooks on remaining select statements
Make mat colour more contrasty and stick in a variable
Explaination text and licensing / authorship
Floor out calculated page and images to 1px x 1px respectively
Set minimum size for placekitten calls
Remove commas from filter return because it makes parseFloat choke