enable getting string format since

CouchDB based Cloudant requires String format sequence number handling for "seq" as follows:

acurl https://jerryj3.cloudant.com/a_event/_changes?feed=continuous
...
{"seq":"625-g1AAAAETeJzLYWBgYMlgTmGQTUlKzi9KdUhJMtMrzsnMS9dLzskvTUnMK9HLSy3JASpjSmRIsv___39WBlPimlygALu5iWGiWWoSkdqTHIBkUj3UhLlgE5JSTc2M0og1IY8FSDI0ACmgIftBpkwEm2JmZmmSZJRIkikHIKaA3TIdbIpBool5ioFxFgB5VlYa","id":"2af9308494fcf09851b068f87acc2a15","changes":[{"rev":"1-b62ae1ce985a636ef11809ba37b0fb18"}]}
...