update git-resource blob
add docs for public flag on jobs

[finishes #79797096]
Merge pull request #9 from concourse/docs-public

Add docs for public flag
upload releases and stemcell in testflight
bump ifrit
bump atc testflight

Submodule src/github.com/concourse/atc ad41350..c12c178:
  > log when build creation fails
Submodule src/github.com/concourse/testflight fbd5ecc..5ec7250:
  > minor cleanup; wait for turbine in flying tests
document perform_on, add 0.18 and 0.19 rel. notes
bump atc

[finishes #81247410]

Submodule src/github.com/concourse/atc c12c178..0f7d3ff:
  > thread resources through scheduler to factory
  > refactor radar runner to use dynamic ifrit group
  > split config db from db interface
  > push config down into database
  > Merge branch 'feature-fine-grained-locking-81247410' of https://github.com/luan/atc into luan-feature-fine-grained-locking-81247410
bump atc

[finishes #80072170]

Submodule src/github.com/concourse/atc 0f7d3ff..3c60fe3:
  > inject proper config db
  > add config validations; can now update via API
pipeline config can be omitted from deployment
add initial docs for pipeline groups
fix typo: groups -> group

[finishes #79704624]
bump atc

[finishes #80072170]

Submodule src/github.com/concourse/atc 3c60fe3..9dd1d94:
  > populate jobs and resources in db lazily
Merge pull request #10 from concourse/pipeline-groups-docs

Initial Docs for Pipeline Groups
clarify pipeline group resources docs

also moved reference to concourse pipeline up; otherwise it looks
related to resources docs

[#79704624]
bump candiedyaml fly yaml.v2

[finishes #80072184]

Submodule src/github.com/cloudfoundry-incubator/candiedyaml 42b748a..96c139b:
  > Improve encoding
  > Handle decoding a nil interface{} to a struct
  > Nesting and composing with aliases and anchors work
  > Initial support for replaying aliases
  > Add YAML 1.2 features
Submodule src/github.com/concourse/fly 228e2b7..fa70103:
  > add 'configure' command
Submodule src/gopkg.in/yaml.v2 0000000...eca94c4 (new submodule)
bump atc fly

Submodule src/github.com/concourse/atc 9dd1d94..841730f:
  > sprinkle omitempty everywhere
Submodule src/github.com/concourse/fly fa70103..b01f6bc:
  > add configure -j for json output
update git-resource blob
Merge branch 'master' into HEAD
release v0.20.0