move RUNNING after ID since it's only relevant for existing containers
let the caller do the formatting
keep truncation logic within the caller
add column to show if the base image of the container is up to date
Merge pull request #70 from bjaglin/uptodate

"Up to date" column in `crane status`
undocumented mapping
Merge pull request #71 from bjaglin/fixdoc

undocumented mapping
rename unordered for what it is rather than what it's currently used for
move target logic into ContainerMap & rename to emphasize mutation
avoid double lookups in maps
Add copyright & licensing note
Add CONTRIBUTORS file
allow cascading to dependents & dependencies when cutting a target subset
expose -d/--dependents & -D/--dependencies