Added feature to print the content of the objetcs

Nice feature added to this useful lib.

Example:

var myObj = {
                'key1' : 'value1',
                'key2' : 'value2',
                'key3' : {
                    'key3_1' : 'value3_1',
                    'key3_2' : 'value3_2'
                },
                'key4' : 'value4',
                'key5' : 'value5',
                'key6' : 'value6',
                'key7' : 'value7'
            };
logger.debug('myObj: ',myObj);