Merge pull request #38 from avsm/master

Improves for mirage-* libraries
Merge pull request #39 from avsm/master

make js_of_ocaml optional in github
Merge pull request #40 from avsm/master

Release conduit, github, cowabloga archives
Merge pull request #41 from avsm/master

mirage-console, cohttp releases
Merge pull request #42 from avsm/master

release tcpip.2.0.0
release dns.0.11.0
Merge branch 'master' of github.com:mirage/mirage-dev
use vchan.2.0.0 release tarball