Option to show all containers, not only running ones

See #161, release log:

• 51dfed5 by @rultor: 0.0.5-SNAPSHOT
• e76b998 by @amihaiemil: javadocs
• d216ea5 by @amihaiemil: Containers.all() + unit test
• b7b567c by @amihaiemil: Merge pull request #160 from l...
• ed148f9 by @llorllale: (#153) Images.filter()
• 1b73a18 by @llorllale: (#154) Filters for ListedImage...
• 761b49b: (#85) RtNetworks, RtNetwork
• e2ec92f by @amihaiemil: Images.save + ListedImages uni...
• cc3295f by @amihaiemil: Update CONTRIBUTING.md
• fa8efb3 by @amihaiemil: Update CONTRIBUTING.md
• 37330b1 by @amihaiemil: Update CONTRIBUTING.md
• d8057b7 by @amihaiemil: Update CONTRIBUTING.md
• 58fe401 by @amihaiemil: Create CONTRIBUTING.md
• cb46de7 by @amihaiemil: rename + puzzles
• bb4774b by @amihaiemil: Merge branch 'master' into 144

Released by Rultor 1.68.1, see build log