Add the jenkins command to source control so that we can update

it without having to fiddle with the jenkins UI.

It also allow us to move files without breaking the CI since we
won't be hard coding the locations of scripts in the jenkins UI.

jenkins.sh

@@ -0,0 +1,9 @@
+#! /bin/bash
+
+set -ex
+
+(cd event-schemas/ && ./check_examples.py)
+(cd api && ./check_examples.py)
+(cd scripts && ./gendoc.py)
+(cd api && npm install && node validator.js -s "client-server/v1")
+(cd event-schemas/ && ./check.sh)