set_reveal_duration
Description:
Sets duration of the animation used when adding or removing pages, in milliseconds.
Parameters:
| this | 
           a carousel  | 
      
| reveal_duration | 
           the new reveal duration value  | 
      
Sets duration of the animation used when adding or removing pages, in milliseconds.
| this | 
           a carousel  | 
      
| reveal_duration | 
           the new reveal duration value  |