Modify luna-webappmanager so that it becomes a simple webapp launcher.

Note: the LS2 service subscription is still incorrect.

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
webapp-launcher cleanup: remove activity management with LS2

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
cleanup: remove LS2 related code

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>
Fixes for application startup, and improvement of help message

Signed-off-by: Christophe Chapuis <chris.chapuis@gmail.com>