Add vanity DockerCon variations of hello-world (#622)

hello-seattle/README-short.txt

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+Hello from DockerCon 2016 (Seattle)!

hello-seattle/content.md

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+# Hello, DockerCon 2016 (Seattle)!
+
+This image is a vanity variant of [the `hello-world` image](https://hub.docker.com/_/hello-world/) created specifically for [DockerCon 2016](http://2016.dockercon.com/). Its use is discouraged.
+
+```console
+$ docker run hello-seattle
+
+Hello from DockerCon 2016 (Seattle)!
+This message shows that your installation appears to be working correctly.
+
+To generate this message, Docker took the following steps:
+ 1. The Docker client contacted the Docker daemon.
+ 2. The Docker daemon pulled the "hello-seattle" image from the Docker Hub.
+ 3. The Docker daemon created a new container from that image which runs the
+    executable that produces the output you are currently reading.
+ 4. The Docker daemon streamed that output to the Docker client, which sent it
+    to your terminal.
+
+To try something more ambitious, you can run an Ubuntu container with:
+ $ docker run -it ubuntu bash
+
+Share images, automate workflows, and more with a free Docker Hub account:
+ https://hub.docker.com
+
+For more examples and ideas, visit:
+ https://docs.docker.com/engine/userguide/
+
+```
+
+See [the `hello-world` image description](https://hub.docker.com/_/hello-world/) for more information about this image (and its construction).

hello-seattle/github-repo

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+../hello-world/github-repo

hola-mundo/README-short.txt

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+¡Hola de DockerCon EU 2015 (Barcelona)!

hola-mundo/content.md

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+# ¡Hola, DockerCon EU 2015 (Barcelona)!
+
+This image is a vanity variant of [the `hello-world` image](https://hub.docker.com/_/hello-world/) created specifically for [DockerCon EU 2015](http://europe-2015.dockercon.com/). Its use is discouraged.
+
+```console
+$ docker run hola-mundo
+
+¡Hola de DockerCon EU 2015 (Barcelona)!
+This message shows that your installation appears to be working correctly.
+
+To generate this message, Docker took the following steps:
+ 1. The Docker client contacted the Docker daemon.
+ 2. The Docker daemon pulled the "hola-mundo" image from the Docker Hub.
+ 3. The Docker daemon created a new container from that image which runs the
+    executable that produces the output you are currently reading.
+ 4. The Docker daemon streamed that output to the Docker client, which sent it
+    to your terminal.
+
+To try something more ambitious, you can run an Ubuntu container with:
+ $ docker run -it ubuntu bash
+
+Share images, automate workflows, and more with a free Docker Hub account:
+ https://hub.docker.com
+
+For more examples and ideas, visit:
+ https://docs.docker.com/engine/userguide/
+
+```
+
+See [the `hello-world` image description](https://hub.docker.com/_/hello-world/) for more information about this image (and its construction).

hola-mundo/github-repo

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+../hello-world/github-repo