Add containers mentioned in volumes-from to dependencies as well
Download 0.8.1 by default
fix indentation in yaml example

Previously was not valid yaml. The 'image' and 'run' attributes have to be inline with 'name'. Also replaced tabs with spaces in the example, but that was just tidying up since when copying and pasting from the README the tabs weren't transferred.
Merge pull request #60 from eggtree/patch-1

fix indentation in yaml example
Refactor dependency resolution

At the same time, expand variables in manual order and groups
correctly. Dependencies can now be resolved in reverse order
all the time, and also in default order if a dependency outside
the target already exists.
Fix error handling in Container.Id()
fix config parsing - ERROR: Duplicated key 'order' in struct crane.Config
Merge pull request #62 from bjaglin/fixparsing

fix config parsing - ERROR: Duplicated key 'order' in struct crane.Config
expose `docker rm --volumes`
Check for running state for linked containers

Closes #64.
Order containers alphabetically

Closes #65.
Merge branch 'expose `docker rm --volumes`'

Conflicts:
	crane/container.go
Add documentation
Add test for Containers()
Fix environment variable handling in Container.Volume().

Closes #61.
de-duplicate container(s) for which dependencies are unresolved
more explicit message
allow controlling truncation behavior in `crane status`, on by default
uppercase header to mimic docker CLI behavior
handle errors nicely