Fix flynn-host command in Procfile

Without id flynn-host fails to start.

Signed-off-by: Artur Roszczyk <artur.roszczyk@gmail.com>
Merge pull request #19 from sevos/patch-1

Fix flynn-host command in Procfile
Set EXTERNAL_IP when booting discoverd

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Update CONTRIBUTING.md

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Update sdutil arguments structure

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Merge pull request #21 from tonistiigi/fix-sdutil

Update sdutil exec arguments
Merge https://github.com/flynn/flynn-dev