Upgrading Netty-socketio makes ARSnova compatible to newer versions of
the official socket.io client.

Version information is now compiled as part of a build and written to
version.properties. It is exposed by the API.

Paul-Christian Volkmer authored 9 years ago and Daniel Gerhardt committed 9 years ago

See http://platform.spring.io/platform/ for more information about it.

This patch makes Spring.IO usable with ARSnova Backend and also updates
some dependiencies not beeing upgraded in ARSnova Backend POM
so I removed explicit version declaration.

Problems with json-path-assert dit not occure, so i removed version
declaration and use managed version 2.0.0.

Remove obsolete version properties

Closes GH-17. This is a squshed version of PCV's PR. (DG)

add swagger maven plugin configuration

This upgrades Spring Framework to version 4.2.

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