These will be consumed by a gRPC service. The server has a public
interface that returns basic information, and a snapshotted list of peer
status/info.

Also some small drive-by fixes.

* Add a ContainsPfxPath method to LocRIB to check if a route exists already.
* Check for nil pathes in compare
* Add myself to CONTRIBUTORS and AUTHORS
* Added docs
* Avoid segfault on nil and remove shaddowing of keyword new
* Make route == nil useful
* Update loc_rib.go