Upstart 1.6 released

Written for upstart by James Hunt on 2012-11-15

* 'telinit u' now performs a stateful re-exec, allowing
    Upstart to continue to supervise jobs after an upgrade
    of either itself, or any of its dependent libraries.
    Adds dependency on libjson (JSON-C).
* Added initramfs-less boot support.
* Allow tests to work in sbuild environment.
* Improved error handling.
* Fixed crasher if 'kill signal' specified as a particular
   numeric.
* Documentation fixes.

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