Get rid of Observable
Supervisor Improvements

startChild now behaves as per the documentation.
Add startNewChild, which both adds _and_ starts the given ChildSpec.
Tighten up the contract for interacting with a Registry
Tighten up the contract for interacting with a Registry
Merge branch 'master' into development
Merge branch 'master' of github.com:haskell-distributed/distributed-process-platform
Merge branch 'master' into development