stop using release candidate branch

don't actually need to commit these artifacts
Merge branch 'master' into HEAD
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purge release candidate .ymls
add atc.publicly_viewable property
allow parameterization of publicly_viewable in template
remove network_name property; autodetect instead
simplify bosh-lite manifest

plus trickery to auto-determine the director uuid.
more example manifest cleanup
Remove .ruby-version
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warden -> garden
detect no-op bump
sandbox -> ci
bump spiff
add exemplary aws vpc manifest

...and a nifty way to know if the official concourse deployment strays
from it

[#78772526]
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