add inet_ntop and inet_pton from
http://svn.apache.org/repos/asf/apr/apr/trunk/network_io/unix/
include stdint.h
fix up includes
Merge pull request #1 from benpicco/77d4095cf065858999ec6240945c14a33c9bfca8

Add inet_pton and inet_ntop (POSIX.1-2001)