Add accessor to compute sockaddr information of flow
Merge branch 'sockaddr-information' of git://github.com/dinosaure/ocaml-conduit into dinosaure-sockaddr-information

Conflicts:
	lib/conduit_lwt_unix.ml
Optcomp out vchan so this builds on MacOS X again
Add conversions between Vchan.Port.t and the input strings
Further improve the Vchan support to compile on Unix

Updates the tests to use the Vchan.In_memory test, which is a
useful 'localhost' version of vchan for use when the real thing
isn't available.
Also include vchan for mirage build
Merge pull request #17 from avsm/vchan-pure-build

Making Conduit build without Vchan