improve relative position handling (e.g. Before End)

• fix: handle relative positions on empty streams that subscribe starting with the last event (e.g. subscribeFrom (Position.Before Position.End)
• feature: sibling to Seq.pairwise that returns the previous value and the current value, where previous value may not exist: Seq.delta : seq<'a> -> seq<'a option * 'a>
  • this is useful for handling changes in state, i.e. "before we had None and now we have 'a"

add Nata.Service, fix Nata.IO.Memory subscription

• fix: Nata.IO.Memory subscription dropped at end of stream (resolved)
• feature: Nata.Service adds channel Consumer and Binding for reliable microservices

fix eventstore multi-subscriptions

• fix: TCS transition task to final when already completed

improve relative positions for eventstore

1.0.4.0

Merge pull request #7 from j-alexander/improve_relative_positions_wit…

competitor functions self-initialize

1.0.3.0

allow competitor functions to self-initialize