0.1.0-beta.1

• feature
  • add widget StatesWidgetBase #64
• refactor
  • remove unused type FlutterEqual #73
  • reimplement widget FlutterScope #71
  • add equality configurableListEquality #70
  • add equality RuntimeTypeEquality #69
  • reimplement widget StatesListener #66
  • reimplement widget StatesBuilder #65
  • remove unnecessary annotation visibleForTesting #63
  • add equality deepObservableEquality #62
  • add equality InstanceAsObservableEquality #61
  • add equality MultiSourcePipeObservableEquality #60
  • add equality PipeObservableEquality #59
  • add equality FallbackObservableEquality #58
  • migrate with InstanceAsObservable #56
  • upgrade dart-sdk(^2.18) and dependencies #55
• docs
  • add api documentation #75
  • add README #72
• example
  • adjust todo example according to readme #76
  • migrate with new States{Builder|Listener} #67
  • add todo example #52
  • add counter example #50
• include changes made from dart_scope 0.1.0-beta.1 #53
  • feature
    • add convenience methods scope.getStates{orNull} #182
    • add observable InstanceAsObservable #181
  • refactor
    • introduce observable MultiSourcePipeObservable #180
    • introduce observable PipeObservable #179
    • add observation.configuration field #178
    • prefer source over observable to name input observable #177
    • upgrade dart-sdk(^2.18) and dependencies #176