Please review JDK-8060204

[Marcus Lagergren]

Please review JDK-8060204 - Remove warnings in Joni and other places

Got rid of ~1400 warnings

Webrev at: http://cr.openjdk.java.net/~lagergren/8060204/ 
<http://cr.openjdk.java.net/~lagergren/8060204/>

/M