Implement cancel and multiple download
Implement cancel and multiple download

Able to cancel download
Clean up error handling
Cancel during unzip
formatting

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