Add an official image for Traefik

* Add an official image for Traefik
* Changed documentation URL

Signed-off-by: Emile Vauge <emile@vauge.com>

traefik/README-short.txt

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+Træfɪk, a modern reverse proxy

traefik/content.md

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+%%LOGO%%
+
+[Træfɪk](https://github.com/containous/traefik) is a modern HTTP reverse proxy and load balancer made to deploy microservices with ease. It supports several backends ([Docker :whale:](https://www.docker.com/), [Swarm :whale::whale:](https://github.com/docker/swarm), [Mesos/Marathon](https://mesosphere.github.io/marathon/), [Consul](https://www.consul.io/), [Etcd](https://coreos.com/etcd/), [Zookeeper](https://zookeeper.apache.org), [BoltDB](https://github.com/boltdb/bolt), Rest API, file...) to manage its configuration automatically and dynamically.
+
+# Example usage
+
+Grab a [sample configuration file](https://raw.githubusercontent.com/containous/traefik/master/traefik.sample.toml) and rename it to `traefik.toml`. Enable `docker` provider and web UI:
+
+```toml
+################################################################
+# Web configuration backend
+################################################################
+[web]
+address = ":8080"
+################################################################
+# Docker configuration backend
+################################################################
+[docker]
+domain = "docker.local"
+watch = true
+```
+
+Start Træfɪk:
+
+```bash
+docker run -d -p 8080:8080 -p 80:80 \
+-v $PWD/traefik.toml:/etc/traefik/traefik.toml \
+-v /var/run/docker.sock:/var/run/docker.sock \
+traefik
+```
+
+Start a backend server, named `test`:
+
+```bash
+docker run -d --name test emilevauge/whoami
+```
+
+And finally, you can access to your `whoami` server throught Træfɪk, on the domain name `{containerName}.{configuredDomain}`:
+
+```bash
+curl --header 'Host: test.docker.local' 'http://localhost:80/'
+Hostname: 117c5530934d
+IP: 127.0.0.1
+IP: ::1
+IP: 172.17.0.3
+IP: fe80::42:acff:fe11:3
+GET / HTTP/1.1
+Host: 172.17.0.3:80
+User-Agent: curl/7.35.0
+Accept: */*
+Accept-Encoding: gzip
+X-Forwarded-For: 172.17.0.1
+X-Forwarded-Host: 172.17.0.3:80
+X-Forwarded-Proto: http
+X-Forwarded-Server: f2e05c433120
+
+```
+
+The web UI [http://localhost:8080](http://localhost:8080) will give you an overview of the frontends/backends and also a health dashboard.
+
+![Web UI Providers](https://traefik.io/web.frontend.png)
+
+# Documentation
+
+You can find the complete documentation [here](https://docs.traefik.io).

traefik/license.md

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+View [license information](https://github.com/containous/traefik/blob/master/LICENSE.md) for the software contained in this image.

update.sh

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 	[sourcemage]='https://github.com/vaygr/docker-sourcemage'
 	[swarm]='https://github.com/docker/swarm-library-image'
 	[thrift]='https://github.com/ahawkins/docker-thrift'
+	[traefik]='https://github.com/containous/traefik-library-image'
 	[ubuntu-debootstrap]='https://github.com/tianon/docker-brew-ubuntu-debootstrap'
 	[ubuntu-upstart]='https://github.com/tianon/dockerfiles'
 	[ubuntu]='https://github.com/tianon/docker-brew-ubuntu-core'