[jenkins] Initial commit of self-upgrading Jenkins

jenkins/README.md

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+A self-upgrading [Jenkins CI](http://jenkins-ci.org/) server
+
+# Basic Usage
+
+To start Jenkins with the latest version:
+
+    ID=$(docker run -d -p 8080:8080 itzg/jenkins)
+
+At a later time, you can upgrade by restarting the container:
+
+    docker stop $ID
+    docker start $ID
+
+# Attaching host directory to Jenkins home directory
+
+The Jenkins home directory is attachable at `/data`, so attaching to a host volume
+would be:
+
+    ID=$(docker run -d -p 8080:8080 -v /SOME_HOST_DIR:/data itzg/jenkins
+
+# Entering the container to perform manual config
+
+As with any Docker container, you can run a shell within the running container:
+
+    docker exec -it $ID bash