add mechanism to filter log messages, improve request dispatch messages
add a serialized puts method
add dispatching environments - modules which will be include in request contexts

  other small fixes to dispatcher: simplify add_module, add a handles? method
substitute singleton em-adapter / thread pool with shared instances in base node class
run local invokations/notifications in their own thread

  seperates the context of the caller and callee all the more so
update specs to incorporate recent commits