Use different browser configuration for dev
Use different browser configuration for dev

Production and CI builds support our full browser matrix, but dev only
gets built for super modern browsers. This makes debugging a bit easier
since more new features are supported and less translpiling from the
original source needs to take place.

dartajax/frontend,thecoolestguy/frontend,jrjohnson/frontend,thecoolestguy/frontend,djvoa12/frontend,djvoa12/frontend,dartajax/frontend,jrjohnson/frontend,ilios/frontend,ilios/frontend