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Async api (#128)

* Refactored Transport for better async use

Still a bit rough, but it now builds a big future using combinators. It
still does one `Runtime::block_on()` to keep the existing API, but this
is a first up before making the whole API async.

* Migrate most APIs to be Future-based

I still need to finish a few of the more tricky ones that I've commented
out for now, but most of it compiles and some examples work. In
particular, `Docker::stats()` now properly returns an async stream of
stats.

* Fix events and containerinspect examples

* Fix imageinspect, images, info and top examples

* Fix containercreate, imagedelete and imagepull examples

* Fix more examples

* Add back debug statement in Transport::request

* De-glob imports in examples

* Remove unused imports in examples

* Fix NetworkCreateOptions serialization

* Add back error message extraction in Transport

* Fix Container::create serialization of options

* Add containerdelete example

* Simplify result

* Fix some error handling to remove unwrap()

* Fix Image::export()

* Fix imagebuild example

* Add adapter from Stream of Chunks to AsyncRead

Having an `AsyncRead` is required to be able to use the `FramedRead` and
`Decoder` stuff from tokio_codec. This code is "borrowed" from
https:/github.com/ferristseng/rust-ipfs-api though should probably be
moved to its own crate or to tokio_codec.

* Fix Container::logs()

It now properly demuxes stdout/stderr, and returns a `Stream<Item =
TtyLine>`.

* Fix Container::export()

* Use LineCodec for streaming JSON

Although in my limited testing it seemed to work fine, there is no
guarantee that 1 chunk == 1 piece of valid JSON. However, each JSON
structure seems to be serialized on one line, so use LineCodec to turn
the body into a stream of lines, then deserialize over this.

* Fix serialization of ExecContainerOptions

* Fix Container::exec() (kind of...)

* Simpl... (continued)

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