fixed a typo in the package name

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
fixed missing wrapper extension to build a framework

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
added some references to subprojects for testing

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
added recursive build of subprojects (must be enabled by RECURSIVE=true)

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>