unzip.js

app.util.unzipFile = function(url, destination, progress) {
	var fileName = url.replace(/^.*[\\\/]/, '');
	var withoutExt = fileName.split('.').shift();
	var promise = new $.Deferred();

	zip.unzip(url, destination,function(done) {
		if( done === 0) {
			// pass the success callback a file object of the new unzipped thing
			resolveLocalFileSystemURL(destination + "/" + withoutExt, function(unzippedFileEntry) {
				console.log("resolving zip promise");
				promise.resolve(unzippedFileEntry);
			});
		} else {
			app.util.progress.stop();
			promise.reject(err);
			console.log("unzip error", done);
		}
	}, progress);

	return promise;
};