Upgrade Libs

[dobsc89]

Upgrade core libs to latest stable versions:

• Netty 4.1.x
• Hibernate 5.2.x

[asolntsev]

@dobsc89 It's not that simple.

• I tried to upgrade Netty and got some compilation errors. It's doable, but somebody needs to review & update Play code to use newer Netty APIs.
• Newest Hibernate doesn't contain class org.hibernate.ejb.Ejb3Configuration anymore. Play uses this class. It's doable, but somebody should upgrade Hibernate initialization in play.db.jpa.JPAPlugin. See https://play.lighthouseapp.com/projects/57987/tickets/1818-hibernate-need-to-be-updated-to-v435

[asolntsev]

Upgrade of Hibernate done: #1114

[dobsc89]

Thanks @asolntsev

[xael-fry]

We already have an issue for upgrade of netty #1940