pre-rewrite

config: parse yaml

api: put -> post

makefile: make clean fix

goreleaser: brew

readme: asciicast update

First binary release

vendor: go-throttle

refactor: lifecycle actions, concurrent checkout

 * JSON config
 * arbitrary images; removed pg/redis/vault pools.
 * lifecycle action plug-ins.
 * removed remote actions.
 * concurrent checkout with `poolset`

fix goproc leak