This upgrades Spring Framework to version 4.2.

See http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/#new-in-4.2.

See:
http://docs.spring.io/spring-security/site/migrate/current/3-to-4/html5/migrate-3-to-4-jc.html#m3to4-header-jc
http://docs.spring.io/spring-security/site/migrate/current/3-to-4/html5/migrate-3-to-4-jc.html#m3to4-filter-urls-cas

Spring Framework has been upgraded to version 4.1.x along with other
dependencies.

The updated Netty-socketio adds compatibility with
socket.io-client >= 1.3.

Presenter now starts a proxy server to the backend API on its own.

This updates Spring, Netty-socketio and additional libraries to their
latest patch releases.

Use JaCoCo instead of Cobertura and remove obsolete Sunfire excludes.

This updates Spring, Logging and Netty-socketio. The new Netty-socketio
version fixes memory leaks and disables SSL3 encryption (POODLE
vulnerability).

Netty-socketio 1.7.3 fixes memory leaks.