Revert "File contents should be compatible to sencha cmd: it expects something to be Ext.define()-ed within the file"

This reverts commit 7878db57f93c103c8639d6555375ff1087c118b8. This causes problems under Ext < 4.2 so I need to investigate further before doing this.
Merge branch 'master' of github.com:bmoeskau/Extensible