Added bugfix to perform out-of-tree contiki apps development
Added possibility to use more tap interfaces than just tap0.
This way we can run two (or indefinite) minimal-net aplications at the same time on tap0 and tap1, later a bridge between tap interfaces is needed.

sudo brctl addbr br0
sudo brctl addif br0 tap0
sudo brctl addif br0 tap1
sudo ifconfig br0 up