Netmask is not applied properly

[rvbcldud]

There is an issue documented here that showcases a problem with how the netmask filters out the address range.

I think this has to do with how the network length is converted to a "character length." See here:

rust/src/lib.rs

Line 75 in 041184c

let network_len = net.prefix() as usize / 4;

In the aforementioned issue, a prefix length of 7 was given. The network_len would then be calculated as 1 "character," leaving 3 bits to be modified by the address rather than preserved by the netmask.

[rvbcldud]

I will be working on a significant rework that uses a bit system instead of a character system. Stay tuned, @rushmorem.

[rvbcldud]

Said rework has been completed in #5