new dist system

fixes #19
fixes #20
check error getting rows after Query
encode empty release set to [], not null
go fmt
require BUILDBRANCH
portable rm -r
windows stubs
don't let plugins crash hk
refine plugin help text whitespace
refactor
clean up error descriptions
discourage people from running old dev builds
note unavailability of binary
fix typo
normalize help text
exclude non-executable plugin files
v3 api; command ls
fix v2 requests expecting no response body
refactor
better instructions on how to get un-expired