dockerbuild skeleton
WIP
Minor format fixes to Makefile
Add github.com/ghemawat/stream dependency
harpoonctl: agent: don't make flags package-globals
harpoonctl: scheduler: don't make flags package-globals
harpoonctl: config: don't make flags package-globals
dockerbuild use standard `c *cli.Context`
Flesh out remainder of dockerbuild
Don't error-write docker stderr
Merge pull request #133 from soundcloud/harpoonctl-dockerbuild

[WIP] harpoonctl dockerbuild