Support the Post Build Script plugin

Lets one execute a shell/groovy script or any builder AFTER the build
has complete.

https://wiki.jenkins-ci.org/display/JENKINS/PostBuildScript+Plugin

All existing builders should be supported since this patch call the
usual dispatcher.

Change-Id: Ide059ec9fd0e556f0c50ec992a6021eb5afb261c
Sort ant builders settings for consistency

The list of settings yielded to the ant builder might be yielded in
different order which produces noisy diff when comparing changes.

Change-Id: Ibaef54bcf11a653934b473722632e07463682328
`test` command read/write stdin/stdout by default

E.g.:

    jenkins-jobs test < config/jenkins.yml

This is convenient for demoing or implementing functional tests.

Change-Id: I4e3030e261d3b90f75e4a033ea074d18764d97bf
Merge "Support the Post Build Script plugin"
Merge "Sort ant builders settings for consistency"
README.rst: Note GitHub PRs are auto-closed

This makes it a little bit clearer that GitHub pull requests are not
accepted and will be automatically closed.

This is a small tweak to help with one of the issues mentioned here:

http://www.alexconrad.org/2014/04/the-painful-process-of-submitting-your.html

Change-Id: Ie4aa8297a75f00ddd9e6c0fce722aa7a6586d52d
Merge "README.rst: Note GitHub PRs are auto-closed"
Merge "`test` command read/write stdin/stdout by default"