Store dev environment images on disk, not S3

# Why?

 * Originally, I was using S3 on development environment to debug S3 issues.
 * We don't have many S3 issues anymore
 * New developers have trouble setting up S3

# What Changed?

 * We will save images on disk if it is a local dev setup (not prod / staging)
I guess this is the worse of two evils- this line is over 80 characters because the value is long.

Prior to indenting it, I was getting multiple indent warnings. I guess I'm cool with 2 `long line` warnings instead of 4 `indent hash` warnings.