This is probably due to something I'm doing wrong, but I'm running sencha app build production (have tried with and without production), but it doesn't seem to generate all-classes.js. My "ext" directory within my application's directory contains 140MB of files, and my ${ext.dir} directory contains 20MB. I don't see any all-classes.js when searching any of the directories within my application. When I run my application in the browser I see it downloading all sorts of JS files that I'm not using, like SegmentedButton.js etc. Am I doing something wrong, or how do I get it to just download the classes required to run my app?