Long animations names cant exist without being cropped down to 6 chars

-- Animation names longer than 6 characters were cropped without this fix.

Hey again,

I just figured out that the animation names in MD2 files, longer than 6 characters are being destroyed, kind of. Everything is shortened to 6 characters. e.g. "running" becomes "runnin" internally, and therefore player.play("running", true); does not work.

The culprit is in rajawali.parser.MD2Parser.class, line 192
```name = name.substring(0, 6).replaceAll("[0-9]{1,2}$", "");```

There should be a better way to read the filenames. My approach is:
```name = name.trim().replaceAll("[0-9]{1,2}$", "");```

Pull request is send.