Javadoc fragment are not exposed as Comments #86

Parsing javadocs the comments are not parsed as in other languages, where docs are retrieved as a roleComment node with a token attribute containing the content of the comment itself

/** 
 * documentation for java class
 * multiline documentation here
 */
class HelloWorldApp {}

An alternative could be to parse docs in the same way in the other languages
Here is an example in php, where the documentation structure is different compared with java, but consistent with comments in all the languages.

<?php
    class Deposit {

        /**
         * the deposit ownner.
         *
         * @var string witout info
         */
        private $_owner;
    }

addendum:
This issue might be related to these similar ones in other languages drivers:
bblfsh/javascript-driver#36 bblfsh/go-driver#28 bblfsh/python-driver#167