Update to more modern travis configuration

Also add the explicit upper bound on io-page.1.2.0 for now.

Signed-off-by: David Scott <[email protected]>

.travis.yml

@@ -1,5 +1,6 @@
 language: c
-script: bash -ex .travis-ci.sh
+install: wget https://raw.githubusercontent.com/ocaml/ocaml-travisci-skeleton/master/.travis-opam.sh
+script: bash -ex .travis-opam.sh
 env:
-  - OCAML_VERSION=4.01.0 OPAM_VERSION=1.1.0
-  - OCAML_VERSION=4.00.1 OPAM_VERSION=1.1.0
+  - OCAML_VERSION=4.01.0 OPAM_VERSION=1.2.0
+  - OCAML_VERSION=4.00.1 OPAM_VERSION=1.2.0

opam

@@ -0,0 +1,25 @@
+opam-version: "1"
+maintainer: "[email protected]"
+
+tags: [
+  "org:mirage"
+  "org:xapi-project"
+]
+build: [
+  [make]
+  [make "install" "BINDIR=%{bin}%"]
+]
+remove: [[make "uninstall" "BINDIR=%{bin}%"]]
+depends: [
+  "ocamlfind"
+  "cmdliner"
+  "lwt" {>= "2.4.3"}
+  "cstruct" {>= "1.0.1"}
+  "shared-memory-ring" {>= "0.4.1"}
+  "mirage-types" {>= "1.1.0"}
+  "ipaddr"
+  "io-page" {>= "1.0.0" & < "1.3.0"}
+  "mirage-xen" {>= "1.0.1" }
+]
+ocaml-version: [>= "4.00.0"]
+os: ["linux"]