• Added a React Native / Relay TodoMVC example app.
• You can now render multiple Relay apps at once, each with their own store.
  The following APIs are early versions and are as of yet undocumented so please
  use them with caution.
  • Added Relay.Environment. Relay.Store is now simply a global instance of
    RelayEnvironment. To create your own isolated store and network subsystem,
    create a new RelayEnvironment() and make use of it wherever environment
    is required.
  • Use Relay.Environment#injectNetworkLayer to inject a custom network layer
    for use within the context of a particular Relay.Environment instance.
  • Added Relay.ReadyStateRenderer. This component takes in an instance of
    Relay.Environment, a queryConfig that conforms to the
    RelayQueryConfigInterface, and a Relay container. It renders
    synchronously based on the supplied readyState. This primitive enables you
    to create alternatives to Relay.Renderer that fetch and handle data in a
    custom way (eg. for server rendered applications).
  • Added Relay.Renderer – a replacement for Relay.RootContainer that
    composes a Relay.ReadyStateRenderer and performs data fetching.
    Relay.RootContainer is now a wrapper around Relay.Renderer that
    substitutes Relay.Store for environment.
• Renamed the Flow type RelayRendererRenderCallback to RelayRenderCallback.
• Renamed the Flow type RelayQueryConfigSpec to RelayQueryConfigInterface.
• RelayContainer.setVariables will no longer check if the variables are
  changed before re-running the variables. To prevent extra work, check the
  current variables before calling setVariables.
• You can now roll back mutations in the COMMIT_QUEUED state using
  RelayMutationTransaction#rollback.
• When specifying a NODE_DELETE or RANGE_DELETE mutation config, you can
  omit parentID if your parent, in fact, does not have an ID.
• In cases where you query for a field, but that field is unset in the response,
  Relay will now write null into the store for that field. This allows you to
  return smaller payloads over the wire by simply omitting a key in the JSON
  response, rather than to write an explicit fieldName: null.
• If the relay prop does not change between renders, we now recycle the same
  object. This should enable you to make an efficient this.props.relay === nextProps.relay comparison in shouldComponentUpdate.
• You can now craft a connection query having invalid combinations of connection
  arguments (first/last/after/before) so long as the values of those arguments
  are variables and not concrete values (eg. friends(first: $first, last: $last) will no longer cause the Relay Babel plugin to throw).
• Added runtime validation to mutation configs to help developers to debug their
  Relay.Mutation.
• Added RelayNetworkDebug. Invoke
  require('RelayNetworkDebug').init(Relay.DefaultNetworkLayer) to enjoy simple
  to read logs of your network requests and responses on the console. Substitute
  your own network layer if you use one.
• Added two new rangeBehaviors:
  • IGNORE means the range should not be refetched at all.
  • REFETCH will refetch the entire connection.
• Connection diff optimization: Enables a mode where Relay skips diffing
  information about edges that have already been fetched. This can be enabled by
  adding @relay(variables: ['variableNames']) to a connection fragment.