duffle 0.1.0-ralpha.4+dramallamabuie

• fixup helloworld example 9e05d0e (Matthew Fisher)
• switch default output to long-form (#548) d31f522 (Matthew Fisher)
• feat(manifest): add images field to duffle.json b32fece (Matthew Fisher)
• fix(create): omit empty fields from duffle create (#558) 3e10bee (Matthew Fisher)
• fix(builder): set ImageType for invocation images (#555) def9d9e (Matthew Fisher)
• feat(manifest): add actions (#567) 2d7f93b (Matthew Fisher)
• feat(install): omitting the tag now fetches the latest semver tag (#559) 91cb690 (Matthew Fisher)
• Rename "components" to "invocationImages" for build manifest (#561) 8574230 (Radu Matei)
• update helloworld example (#550) 20ce169 (Matthew Fisher)
• remove unused CI files (#549) 8520555 (Matthew Fisher)
• feat(Dockerfile): add jq 5fcded1 (Vaughn Dice)
• ref(create): switch default registry to deislabs (#544) ef20a2c (Matthew Fisher)
• feat(create): fill out maintainers and keywords fields (#543) 161a17a (Matthew Fisher)
• ref(list): display bundles in table form by default (#531) 62543a5 (Matthew Fisher)
• docs(build.go): update duffle build cmd description d0f4776 (Vaughn Dice)
• feat(build): add --output-file flag (#537) b70f072 (Matthew Fisher)
• Docker driver fixes (#533) c71a627 (Simon Ferquel)
• fix(create): lowercase manifest file (#539) eb07f7d (Matthew Fisher)
• ref(create): switch default file format to JSON (#536) f7a9178 (Matthew Fisher)
• ref(duffle): rename "inspect" to "show" (#534) f698725 (Matthew Fisher)
• feat(list): show that a bundle is signed/unsigned (#524) 9e13f4e (Matthew Fisher)
• mark pull/push/search as under construction (#526) 623babe (Matthew Fisher)