code: function isUrl (obj) {
      if(isString(obj)){
          if((obj.indexOf('http://') > -1 || obj.indexOf('https://') > -1) 
          	&& obj.indexOf('.') > -1)
          	return true
          else
          	return false
      }else{
          return false;
      }
  }
docs: is an object a URL - very simple version