Don't change the persist setting if unspecified
Merge pull request #9 from infidel/master

Don't change the persist setting if unspecified
Sync CHANGES and bump version to 1.1.0
Merge pull request #10 from avsm/master

Sync CHANGES and bump version to 1.1.0
set_ipaddr renamed to set_ipv4, ip conversion to bytes is now done by Ipaddr.
Improved getifaddrs interface to something easier to work with.
Update tests.
Added an opam file for local pinning, update the .merlin file.