Initial commit.
Adds ClientRequest and builders.
Minor re-org of dependencies.

Adds also a simple mock service with chunked transfer encoding.
Adds support for chunked encoding.
Adds a simple integration test for chunked-encoded responses.
Adds a MutableResponseProcessor to assist processing chunked encoded responses.
Adds a subscriber that collects all chunks into a a List<T>.
More flexible API for executing requests.
Renames test package for design tests.
Split out WireMock set-up in test classes.
Adds HTTP status codes.
Renamed to RxHttpClient.
Adds a README.