Fixes 2 issues while adding amazon-fireos platform after fresh cordova install.
1. create.js updated to create "libs" folder before copying it to the project's platform folder.
2. check_reqs.js updated to report error and abort if awv_interface.jar is missing from libs folder.
JS confirm dnd alert dialog in Cordova consumes all key events

Removed the code which was listening to key events and was only handling the backbutton.