Akara Sucharitakul

Create PersistentQueueAppender and PersistentQueueSource

1

This is complementary to `PersistentBuffer` allowing persistent queue separation into two streams on potentially two different processes.

Clean up test cases for #175

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The test cases may still be a little hard to understand and some of the tests would always be passing. We need to ensure the test cases are valid.

And make it configurable.

ClientFlow should allow for environment-specific configuration

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Such configuration should be recognized by `ClientFlow`: ``` svc1 { type = squbs.httpclient akka.http.host-connection-pool { max-connections = 10 } QA { // Any standard configuration akka.http.host-connection-pool { max-connections = 2...

Need a thorough review of the APIs and make sure all is documented. Actor-based interaction would need different kind of documentation, which should be pursued differently.

Creating this issue as a follow up of the comments on #370 in order to allow its merge and resolution.

The squbs-testkit supports for `RouteDefinition`. We need to make sure it can support `FlowDefinition`, too.

Case class with nested inner class not resolving properly.

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Simple example: ```scala object TestMessages { case class InnerMessage(id: Int, name: String) } import TestMessages._ case class NestedInnerMessage(id: Int, inner: InnerMessage) ``` Writing this message works correctly: ```scala "write a...