Use ocaml-hex
Add an opam file
Update Travis CI scripts from https://github.com/samoht/ocaml-travisci-skeleton
sync Travis CI scripts
Improve README
always say yes to opam
(test) Cache apt repo in travis CI
mirage-fs-unix needs to be installed for building the tests
Merge pull request #17 from samoht/master

Add opam file, improve Travis CI scripts