Added classmethods parser

I have added class methods parser, shows as additional tab for objects.

Example: http://www.opengluco.com/demo/kint/demo.php

It shows all class methods sorted by access type and name.

The "+" displays documentation block (if available for given method).

Return value is parsed from PHPDocumentor @return if available.

![kint_classmethods](https://f.cloud.github.com/assets/4125756/368153/6857da66-a2b9-11e2-94b6-1588950a47f4.png)