Move the IPv4 pattern stuff into its own module and begin a real test suite.
-rw-r--r-- 46 Setup.hs
drwxr-xr-x - doc
-rw-r--r-- 2358 harbl.cabal
-rw-r--r-- 925 makefile
drwxr-xr-x - src
drwxr-xr-x - test