Clarify cwd#307

Merged

mrunalp merged 2 commits intoopencontainers:masterfrom

vbatts:carry-cwd

Jan 13, 2016

Commits on Dec 29, 2015

define the default value for the `cwd`
laijs
committed

Commits on Jan 13, 2016

config: cwd is a required default
vbatts
committed