adding headers and fixing minor issue with background unzipping
adding headers and fixing minor issue with background unzipping

phonegap/phonegap-plugin-contentsync,phonegap/phonegap-plugin-contentsync,purplecabbage/phonegap-plugin-contentsync,purplecabbage/phonegap-plugin-contentsync,revolunet/phonegap-plugin-contentsync,revolunet/phonegap-plugin-contentsync,phonegap/phonegap-plugin-contentsync,phonegap/phonegap-plugin-contentsync,revolunet/phonegap-plugin-contentsync,purplecabbage/phonegap-plugin-contentsync,phonegap/phonegap-plugin-contentsync,chrisland/phonegap-plugin-contentsync,chrisland/phonegap-plugin-contentsync,chrisland/phonegap-plugin-contentsync,revolunet/phonegap-plugin-contentsync,revolunet/phonegap-plugin-contentsync,chrisland/phonegap-plugin-contentsync,purplecabbage/phonegap-plugin-contentsync,phonegap/phonegap-plugin-contentsync,chrisland/phonegap-plugin-contentsync,purplecabbage/phonegap-plugin-contentsync