iptables_fw_init: fix memory leak

ext_interface is always allocated from either safe_strdup or
get_ext_iface, but is never freed.
Merge pull request #28 from pawitp/pull-1

iptables_fw_init: fix memory leak
Ignore autogenerated files
Add IP to login script URL parameters
Merge pull request #35 from Sannis/autogenerated_ignore

Ignore autogenerated files
Merge pull request #36 from Sannis/add_ip_to_login_page

Add IP to login script URL parameters
Merge pull request #5 from wifidog/master

merged wifidog master branche