Enable examples to be built in the target tree. This entails installing
the project files and possibly other missing stuff.
Task-number: QTBUG-27977

Change-Id: I159fd8e3ebc7077e1d68e085c4947acc058ce594
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>