Merge pull request #82 from bio-routing/feature/ipv6_support

config/BUILD.bazel

config/peer.go

main.go

net/BUILD.bazel

net/ip.go

net/ip_test.go

net/prefix.go

net/prefix_test.go

protocols/bgp/packet/BUILD.bazel

protocols/bgp/packet/decoder_test.go

protocols/bgp/packet/path_attributes.go

protocols/bgp/packet/path_attributes_test.go

protocols/bgp/server/fsm.go

protocols/bgp/server/fsm_established.go

protocols/bgp/server/fsm_test.go

protocols/bgp/server/peer.go

protocols/bgp/server/server_test.go

protocols/bgp/server/update_sender.go

protocols/bgp/server/update_sender_test.go

protocols/bgp/server/withdraw.go