Also publish "latest" image
Merge pull request #3 from Clever/publish-latest

Also publish "latest" image
Allow publishing from base directory

Some our our respositories have Dockerfiles with commands like ADD . /path. These don't
work if we do - < Dockerfile because the only thing in "." will be the Dockerfile, not
the other things we want. This allows us to support that use case.
Merge pull request #4 from Clever/publish-from-base-dir

Allow publishing from base directory
AMerge branch 'master' of github.com:Clever/drone into clever

Conflicts:
	pkg/plugin/publish/docker.go