Merge pull request #145 from avsm/master

Travis: update deps (missing crunch)
Merge pull request #148 from avsm/master

Http: simplify example by using `Cstruct.copyv` instead of manual concat
xen: generate a main.xl during configure

Note we don't configure block or network devices. To compensate we
add some examples and documentation links to the config file.
Merge pull request #154 from djs55/add-xen

xen: generate a main.xl during configure
Update CHANGES
Merge pull request #155 from djs55/add-xen

Update CHANGES
The HTTP dependency now also installs `mirage-tcp-*`.

Otherwise we get a dependency failure as cohttp doesnt compile
the Mirage backends.
bump to 1.0.3 working version