Add two handy scripts for network stuff

nmap_network.sh

Here we have a script that scans and generates XML for the devices found in 192.168.1.1-254.
Currently it takes almost two minutes... we should forver be trying to lower this.

wemo_list.sh

Here we have a script that lists all wemo devices on the network by using the ouemeaux server.
We can start by using the ouemeaux server to drive all the Belkin Wemos on the network. We can
always implement the library natively in the driver and issue commands through it if/when
necessary.

new file:   scripts/nmap_network.sh
new file:   scripts/wemo_list.sh