Added rplinfo as submodule

Signed-off-by: Kiril Petrov <ice@geomi.org>
Activate rplinfo's routes and parent REST resourses

Signed-off-by: Kiril Petrov <Kiril Petrov ice@geomi.org>
Merge branch 'master' of https://github.com/retfie/cc2538_coap_sensor