fix block comment format "\n"

compile the coffeescript has block comment like:

```coffeescript
###
test comment
###

define (require, exports, module) ->

  ###
  test comment
  ###
  exports.setName = ->
    "wx"

  ###
  test comment
  ###
  exports.setAge  = ->
    88
```


it will output:

```javascript
/*
test comment
*/

define(function(require, exports, module) {
  /*
  test comment
  */

  exports.setName = function() {
    return "wx";
  };
  /*
  test comment
  */

  return exports.setAge = function() {
    return 88;
  };

```

the block comment close to the prev statement.
I want to compile coffee output comment close to the next statement.

after the pull request, compile  coffee src will output:
```javascript
/*
test comment
*/
define(function(require, exports, module) {

  /*
  test comment
  */
  exports.setName = function() {
    return "wx";
  };

  /*
  test comment
  */
  return exports.setAge = function() {
    return 88;
  };
});

```