* use pseudo-depdencies in build/build.go to convince dep
* update Travis, Dockerfile and Docs
* build.Dockerfile image now contains the Go build dependencies
* => faster builds
* bump pdu file after protoc update
fixes#106
Didn't notice it because vendor/ was already populated on my dev
machine, but did notice it in Docker build.
Docker build now consumes devsetup like regular user, so this should
catch future problems.
Remove remaining curl|shit functionality from lazy.sh (no checkout logic
needed anymore).
refs #35
