Android / Phonegap APK is too big for Google Play. How do I implement extensions?

I was finally able to get the phonegap / dreamweaver app to work on Android and have a working APK file.
however, the final APK will be much larger than 50MB (Google Play Limit) due to the fact that it contains 700 images. I understand that I can host them on a server, but I want the application to be fully usable when it is offline or offline.

To get the limitation I need to use extension files. http://developer.android.com/google/play/expansion-files.html

Has anyone successfully done this with an app that was built with phonegapp / dreamweaver and finished in eclipse?

If so, would appreciate a guide on the best way to do this .... Can I honor my www folder and make this extension file? how to link it correctly in eclipse?

Noel