Upgraded to Maven APT Plugin 1.1.2 and Querydsl 3.4.3.

Added Christoph as project maintainer, too. Fixed maintainer's email addresses. Removed obsolete encoding property. Upgraded to Lombok 1.14.6. Switched to simplified Java 8 setup (using the property instead of a plugin declaration).
Upgrade to Spring 4.1.

Switched to Rome 1.5 for MongoDB text search example as that's needed after the Spring 4.1 upgrade.