rename notification actions
rename CommandInterface notify methods
remove release transition from registering and waiting
remove release transition from retrying_release
create lots of specific notify* callbacks
EventGenerator: log unexpected http responses in
remove "done" state
rename "signal" event to "shutdown"
change unexpected http response mesage
rename "signal" methods to "shutdown"
replace blocking shutdown code with async code
remove unreachable method
remove "done" state from state machine figure
rename "done" to "fail" in spec
EventGenerator: pass $class to bless
check release() return value for truth not definition
croak when release claim fails
extract _remove_named_claim
make remove_claim private
make add_claim private