add support for workflow continuation, and a total ordering of state across continued workflows
add workflowEpoch and startedEventId to SerializedState, to provide a total ordering of events across workflow continuations. Thread the workflowEpoch through, and expose in FSMContext so any user defined errors states can thread it through when necessary
rm log
rm log
cleanup test
fix lint
Merge pull request #48 from sclasen/continuation-epochs

Continuation epochs