[3.0.3] RemotingProvider - return requestId in "doSend"

[MindPatterns]

In some cases, it would be useful to have the current requestId returned by the "doSend()" method in RemotingProvider:

    
doSend : function(data){
        var o = {
            url: this.url,
            callback: this.onData,
            scope: this,
            ts: data,
            timeout: this.timeout
        }, callData;

        if(Ext.isArray(data)){
            callData = [];
            for(var i = 0, len = data.length; i < len; i++){
                callData.push(this.getCallData(data[i]));
            }
        }else{
            callData = this.getCallData(data);
        }

        if(this.enableUrlEncode){
            var params = {};
            params[Ext.isString(this.enableUrlEncode) ? this.enableUrlEncode : 'data'] = Ext.encode(callData);
            o.params = params;
        }else{
            o.jsonData = callData;
        }
        return Ext.Ajax.request(o);
    },