standalone iplist creator

Recreated this script I have no idea how many times. Basically takes a list of ranges and converts it to a straight line by line ip list.

Example run:

```
echo 192.168.100.0-50 >> rangelist.txt
echo 192.155-156.0.1 >> rangelist.txt
echo 192.168.200.0/25 >> rangelist.txt
ruby tools/makeiplist.rb
cat iplist.txt
192.168.100.0
192.168.100.1
192.168.100.2
192.168.100.3
etc...
etc...
```