Create a netmask from an IP range

[coderholic]

This is an awesome module for creating IP ranges from a given netmask, but it'd be even better if it worked in reverse, eg:

coffee> n = new netmask.Netmask('10.0.0.0/24')
{ bitmask: 24,
maskLong: 4294967040,
netLong: 167772160,
size: 256,
base: '10.0.0.0',
mask: '255.255.255.0',
hostmask: '0.0.0.255',
first: '10.0.0.1',
last: '10.0.0.254',
broadcast: '10.0.0.255' }

coffee> n = new netmask.Netmask('10.0.0.1', '10.0.0.254')
{ bitmask: 24,
maskLong: 4294967040,
netLong: 167772160,
size: 256,
base: '10.0.0.0',
mask: '255.255.255.0',
hostmask: '0.0.0.255',
first: '10.0.0.1',
last: '10.0.0.254',
broadcast: '10.0.0.255' }