Merge branch 'master' of https://github.com/rancher/k3d

Merge pull request k3d-io#91 from rancher/feature/import-images-helper

[Feature] import images from docker daemon into k3d using a helper container

enable importing multiple images at once

Merge pull request k3d-io#76 from andyz-dev/no-timeout

[Enhancement] Deprecate --timeout, shift short hand options around

Merge pull request k3d-io#63 from rancher/refactor-docs

[Docs] Prepare for proper documentation

Merge pull request k3d-io#56 from andyz-dev/list-all

[Enhancement] Make list command always show all clusters. Remove --all option

Merge pull request k3d-io#52 from andyz-dev/rename

[Enhancement] Rename cli/config.go to cli/cluster.go

Merge pull request k3d-io#43 from rancher/feature/enhanced-port-mapping

[Feature] Enhanced port mapping (node-specifiers, optional offset, ...)

Merge pull request k3d-io#41 from andyz-dev/center-align

[Enhancement] Center align list output

Merge pull request k3d-io#32 from andyz-dev/publish

[Feature] Add --publish/--add-port flag for port mappings