Consider an upper threshold for warning when a resource's file size is too large

[jweiser]

A file increase of any amount is currently acceptable, but you're right - I want to implement something to alert us to a suspicious jump in size. I'm just thinking of what the threshold would/should be.

Originally posted by @jweiser in #1 (comment)

[cookersjs]

My 2cents are that a change in file size of 10% is probably reasonable