Build and test using Docker

Signed-off-by: Ben Firshman <ben@firshman.co.uk>

script/build

@@ -1,2 +1,4 @@
 #!/bin/sh
-GOPATH=`pwd`/Godeps/_workspace:$GOPATH go build
+set -e
+docker build -t docker-machine .
+exec docker run --rm -v `pwd`:/go/src/github.com/docker/machine docker-machine gox -os="darwin linux" -parallel=5

script/test

@@ -1,2 +1,4 @@
 #!/bin/sh
-GOPATH=`pwd`/Godep/_workspace:$GOPATH go test -v ./...
+set -e
+docker build -t docker-machine .
+exec docker run --rm docker-machine go test -v ./...