Fixed is_valid_ip not detecting ipv6
avoid magic numbers
remove unused exception variable (PEP8)
Merge pull request #3 from murrown/church29-networkipv6tests

avoid magic numbers
is_ip_list, and is_valid_ip, default to iptype none, checks for ipv6 and ipv4 if no iptype is given
Edited is_valid_ip for readability
maximum elegance
Merge pull request #4 from murrown/church29-networkipv6tests2

maximum elegance

Excellent
Merge pull request #39 from church29/networkipv6tests

Fixed is_valid_ip not detecting ipv6