code: function random(_length) {
      
      var string_length = _length;
      if(string_length < 0)
      	string_length = 1;
      	
      var chars = "0123456789";
      
      var num = '';
      for (var i=0; i<string_length; i++) {
          var rnum = Math.floor(Math.random() * chars.length);
          num += chars.substring(rnum,rnum+1);
      }
      return num*1;
  }
docs: Generates a random number of the provided length
  
  @param {int} _length
  @api public