Version is autodetected on build using git
If it cannot be detected with git, an override must be provided.
For tracability of distros, the distroy packagers should override as
well, which is why I added a README entry for package mainatiners.
refs #35
* Idempotent clone_and_build.sh does everything
* Add documentation for how to build in Docker
Had to sacrificy go generate because stringer apparently can't handle
vendor directory used by go dep, fails with error
on go generate rpc/frame_layer.go
refs #37
