version 0.3.1

The new module layout. Utilities IPRoute and IPDB moved to pyroute2; all the netlink protocols moved to pyroute2.netlink.

The release is the intermediate step before the new approach, where all the netlink providers are simple threadless (but threadsafe) socket objects, and all the «cluster-oriented» code is deprecated. The new architecture one can review at the master branch, expected 0.3.2 release time — the end of November.