fix invalid mime type for defer.js
fix invalid mime type for defer.js

koala-framework/koala-framework,yacon/koala-framework,nsams/koala-framework,kaufmo/koala-framework,kaufmo/koala-framework,nsams/koala-framework,kaufmo/koala-framework,nsams/koala-framework,yacon/koala-framework,koala-framework/koala-framework,yacon/koala-framework